American Psychiatric Association.1980. Diagnostic and Statistical Manual of Mental Disorder Third Edition (DSM-III) . Washington: American Association Press.
2.
Anell, B.1958. Preface. In: Geophagical Customs (eds. Anell, B. and Lagercranz, S.) Studia Ethnographica Upsaliensia17:1-23.
3.
Associated Press.1988. Eating dirt hard habit to break. ToreroStar, October.
4.
Bateson, E.M. and Lebroy, T.1978. Clay eating by Aboriginals of the Northern Territory . Medical Journal of Australia (Special Supplement)1:1- 3.
5.
Beiser, M., Ravel, J.L., Collomb, H., and Egelhoff, C.1972. Assessing psychiatric disorder among the Serer of Senegal . Journal of Nervous and Mental Disease154:141-151.
6.
Beiser, M., Burr, W.A., Collomb, H. and Ravel, J.1974. Pobough Lang in Senegal. Social Psychiatry9:123-129.
7.
Bicknell, D.H.1975. Pica: A Childhood Symptom. London: Butterworth.
8.
Von Bonsdorff, B.1977. Pica: A hypothesis. British Journal of Haematology35:476-477.
9.
Bruhn, C.M. and Pangborn, B.M.1971. Reported incidence of pica among migrant families , Journal of American Dietetic Association58:417-20.
10.
Cavdar, A., ARCASOY, A., CIN, S., BABACAN, E. and GOZDASOGLU, S. 1983. Geophagia in Turkey: Iron and zinc deficiency, iron and zinc absorption studies and response to treatment with zinc. Progress in Clinical and Biological Research129:71.
11.
Chen, X., Yin, T., He, J., May, Q., Ran, Z. and Li, L.1985. Low-levels of zinc in hair and blood, pica, anorexia, and poor growth in Chinese preschool children. American Journal of Clinical Nutrition42:694-700.
12.
Christopherson, M.A. and Cantab, M.D.1910. Earth-eating in the Egyptian Sudan. Journal of Tropical Medicine and Hygiene, Jan. 1st:3-7.
13.
Clayton, R.S. and Goodman, P.H.1955. Roentgenographic diagnosis of geophagia. American Journal of Roentgenology73:203-7.
14.
Coltman, C.A.1969. Pagophagia and iron lack. Journal of the American Medical Association207:513-516.
15.
Cooper, M.1957. Pica. Springfield ( Illinois): Charles C. Thomas.
16.
Cragin, F.W.1835. Observations on cachexia africana, or dirt-eating . American Journal of the Medical Sciences17:356-362.
17.
Crosby, W.H.1976a. Food pica and iron deficiency. Archives of Internal Medicine127:960-61.
18.
_ 1976b. Pica. Journal of the American Medical Association253:2765-68.
19.
_ 1976c. Pica: A compulsion caused by iron deficiency. British Journal of Haematology34:341-42.
20.
Danford, D.E.1982a. Pica among mentally retarded adults. American Journal of Mental Deficiency87:141-45.
21.
_ 1982b. Pica and nutrition. Annual Review of Nutrition 2:303-322. 1983. Pica and zinc. Progress in Clinical and Biological Research129:185.
22.
Danford, D.E. and Huber, A.1981. Eating dysfunction in an institutionalized mentally retarded population. Appetite2:281-292.
23.
Dickens, G. and Trethowan, W.1971. Cravings and aversions during pregnancy. Journal of Psychosomatic Research15:259-68.
24.
Duprey, A.J.B.1900. The anaemia of dyspepsia consequent on dirt-eating . Lancet2:1192-3.
25.
Eastwell, H.D.1979. A pica epidemic: A price of sedentarism among Australian ex-hunter-gatherers. Psychiatry42:264-273.
26.
Edwards, C., McDonald, S., Mitchell, J., Jones, L., Mason, L., Kemp, A., Laing, D. and Trigg, L.1959. Clay-and cornstarch-eating women. Journal of the American Dietetic Association35:810-815.
27.
Edwards, C., McDonald, S., Mitchell, J., Jones, L., Mason, L. and Trigg, L.1964. Effect of clay and cornstarch intake on women and their infants. Journal of the American Dietetic Association44:109-115.
28.
Edwards, C., McSwain, H. and Haire, S.1954. Odd dietary practices of women. Journal of the American Dietetic Association30:976-981.
29.
Feldman, M.D.1986. Pica: Current perspectives. Psychosomatics27:519-523.
30.
Galt, F.L.1872. Medical notes on the Upper Amazon. American Journal of Medical Sciences64:395-416.
31.
Glickman, L.T.1981. Pica patterns, toxocariasis and elevated blood lead in children. American Journal of Tropical Medicine Hygiene30:77-80.
32.
Greenberg, M., Jacobziner, H., McLAUGHLIN, M. Fuerst , H. and Pel-Litieri , O.1958. Pica in relation to lead poisoning. Pediatrics22:756-760.
33.
Grivetti, L.E.1978. Culture, diet and nutrition: Selected themes and topics . Bioscience28:171-177.
34.
Grivetti, L.E.Gutelius, M.F., Millican F.K., Layman, E.M., Cohen, G.J. and Dublin, C.C.1962. Nutritional studies of children with pica. Pediatrics29:1012-17.
35.
Halsted, J.A.1968. Geophagia in man: Its nature and nutritional effects . American Journal of Clinical Nutrition21:1384-1393.
36.
Hawass, N., Alnozha, M. and Kolawole, T.1987. Adult geophagia — Report of three cases with review of the literature. Tropical and Geographical Medicine39:191-195.
37.
Herrick, J.B.1910. Peculiar elongated and sickle-shaped red blood corpuscles in a case of severe anemia. Archives of Internal Medicine6:517-519.
38.
Hooper, D. and Mann, H.1906. Earth and the earth-eating habit in India. Memoirs of the Asiatic Society of Bengal1:249-270.
39.
Von Humboldt, A.1907 (first published in 1815-26 in 7 volumes, in French). Personal Narrative of Travels to the Equinoctial Regions of America 1799- 1804. London: George Bell and Sons . Vol. 2, pp. 494-504.
40.
Hunter, J. and De Kleine, R.1984. Geophagy in Central America. TheGeographical Review74:157-169.
41.
Hunter, J.M.1973. Geophagy in Africa and the United States: A culture-nutrition hypothesis. TheGeographical Review63:170-95.
42.
Kaplan, H. I. and Sadock, B. J. (eds.) 1980. Comprehensive Textbook of Psychiatry. Baltimore: Williams and Wilkins. (p. 2602)
43.
Key, C., Horger, E.O. and Miller, J.M.1982. Geophagia as a cause of maternal death. Obstetrics and Gynecology60:525-6.
44.
Kolandwelu, A.1979. Pica. Journal of Indian Medical Association73:195.
45.
Koptagel, G. and Reimann, F.1973. An investigation on the psychopathology of pica and hypochromic anaemia. PsychotherapyPsychosomatics22:351-358.
46.
Lagercranz, S.1958. Geophagical Customs in Africa and Among the Negroes in America. In: Geophagical Customs. Studia Ethnographica Upsaliensia17, pp. 24-84.
47.
Laufer, B.1930. Geophagy. Field Museum of Natural History Publication No. 280, Anthropology Series, Vol. 18, No. 2.
48.
Leming, P.D., Reed, D. and Martelo, O.1981. Magnesium carbonate pica: An unusual case of iron deficiency . Annals of Internal Medicine94:660.
49.
Lourie, R.1963. Why children eat things that are not food. Children10:43.
50.
Lourie, R.S., Sokoloff, B. and Takahashi, L.Y.1958. A Study of the Etiology of Pica in Young Children, An Early Pattern of Addiction. In: P. H. Hoch and J. Zubin (eds.) Problems of Addiction and Habituation. New York: Grune and Stratton.
51.
McLoughlin, I.J.1987. The Picas. British Journal of Hospital Medicine, April:286-289.
52.
Mengel, C.E., Carter, W.A. and Horton, E.1964. Geophagia with iron deficiency and hypokalemia . Archives of Internal Medicine114:470-74.
53.
Minnich, V., Okcuoglu, A., Tarcon, Y., ARCASOV, A., CIN, S., YORUKOGLU, O., RENDA, F. and DEMIRAG, B. 1968 . Pica in Turkey: Effect of clay upon iron absorption. American Journal of Clinical Nutrition21:78-86.
54.
Mitchell, D., Laycock, B.S. and Stephens, B.S.1977. Motion sickness-induced pica in the rat. American Journal of Clinical Nutrition30:147-150.
55.
Okcuoglu, A., Arkasoy, A., MINNICH V., TARCON, Y., CIN, S., YORUKOGLU, O., DEMIRAG, B. and RENDA, F. 1966. Pica in Turkey. American Journal of Clinical Nutrition19:125-31.
56.
O'Rourke, D.E., Quinn, J.G., Nicholson, J.O. and Gibson, H.H.1967. Geophagia during pregnancy. Obstetrics and Gynecology29:581-84.
57.
Prasad, A.S., Halsted, J.A. and Nadim, M.1961. Syndrome of iron deficiency anaemia, hepatosplenomegaly, hypogonadism, dwarfism, and geophagia, American Journal of medicine31:532-46.
58.
Sayers, G.J., Lipschitz, D.A., Sayers, M., Seftel, H.C., Bothwell, T.H. and Charlton, P.W.1974. Relationship between pica and iron nutrition in Johannesburg Black adults. South Africa Medical Journal48:1655-60.
59.
Sayetta, R.B.1986. Pica: An overview. American Family Physician33:181-185.
60.
Scott, R. B. (ed.) 1973. Price's Textbook of the Practice of MedicineEleventh Edition. London: Oxford University Press. pp. 1054-1065.
61.
Solien, N.L.1954. A cultural explanation of geophagy. FloridaAnthropologist7:1-9.
62.
Snowdon, J.1989. Pharmaceutical chemist — personal communication.
63.
Thompson, R.B. and Proctor, S.J.1984. A Concise Textbook of Hematology. Baltimore: Urban and Schwartzenberg. pp. 5-87.
64.
Vermeer, D.1966. Geophagy among the Tiv of Nigeria. Association of American Geographers56:197-204.
65.
_ 1971. Geophagy among the Ewe of Ghana. Ethnology10:56-72.
66.
Vermeer, D.E. and Frate, D.A.1975. Geophagy in a Mississippi county. Annals of Association of American Geographers63:414-24.
67.
_ 1979. Geophagia in rural Mississippi. American Journal of Clinical Nutrition32:2129-2135.
68.
Weatherall, D.J. and Clegg, J.B.1972. The Thalassaemia SyndromesSecond Edition. Oxford: Blackwells.
69.
Youdim, M. and Iancu, T.C.1978. Pica hypothesis. British Journal of Haematology36:298.