Babcock, J.W. : Alienist and Neurologist, 1895, 16, 423.
2.
Bevis, W.M.: Amer. J. Psychiat., 1921, 1, 69.
3.
Dovenmuehle, R.H., Busse, E.W., and Newman, E.G.: J. Amer. Geriat. Soc., March 1961, 9, 208.
4.
Faris, R.E.L. , and Dunham, H.W.: The Amer. Sociolog. Rev., 1937, 2, 467.
5.
Green, E.M.: J. Insanity, 1917, 73, 619.
6.
Hagood, M.J., and Price, D.C.: Statistics for Sociologists, Holt & Co., New York. Revised Edition, 1957, p. 361.
7.
Hollingshead, A.B., and Redlich, F.C.: Social Class and Mental Illness, John Wiley & Sons, Inc., New York, 1958.
8.
McGough, W.E., and Blackley, R.J.: Personal Communication.
9.
Nolan, W.J.: State Hosp. Quart., 1918, IV, 75.
10.
Noyes, Arthur P.: Modern Clinical Psychiatry, W. B. Saunders Co., Philadelphia, 1954, 331.
11.
O'Malley, M. : J. Insanity, 1914, 71, 309.
12.
Prange, A.J.Jr., and Vitols, M. MInt. J. Psychiat., 1962, 8, 104.
13.
Sainsbury, Peter: in Process of Aging, Volume 2, Atherton Press, New York, 1963, 153.
14.
Singer, H.D.: in Mental Disorders in Urban Areas, Hafner Publishing Co., New York, 1939 (Second Edition 1960), p. viii.
15.
Stem, L.: Kulturkreis und From der Geistugen Erkrankung (Halle : Carl Marhold, 1913).
16.
Stromgren, Erik: in Processes of Aging, Volume 2, Atherton Press, New York, 1963, 133.
17.
Srole, Leo, Langner, Thomas S., Michael, Stanley T., Opler, Marvin K., and Rennie, Thomas, A.C.: Mental Health in the Metropolis, McGraw Hill Book Company, New York, 1962, Chapter IX, p. 157.
18.
Tietze, C., Lemkau, P., and Cooper, M.: Amer. J. Sociol., 47, 167 (Sept. 1941).
19.
Vitols, M.M. : N. Carolina Med. J., 22, April 1961.
