Bowden, Edgar1972 "Standardization of an index of sociocultural development for precivilized societies," American Anthropologist74: 1122-32.
2.
Ember, Melvin1963 "The relationship between economic and political development in nonindustrialized societies," Ethnology2: 228-48.
3.
Marsh, Robert M.1967Comparative sociology; a codification of cross-societal analysis, New York, Harcourt, Brace & World.
4.
Murdock, George P.1967Ethnographic Atlas: a summary, Pittsburgh , University of Pittsburgh Press.
5.
1972Outline of world cultures, 4th ed., rev., New Haven, Human Relations Area Files, Inc.
6.
Naroll, Raoul1956 "A preliminary index of social development, American Anthropologist58: 687-715.
7.
1967 "The proposed HRAF probability sample," Behavior Science Notes 2: 70-80.
8.
Naroll, Raoul, and William T. Divale n.d. Natural selection in cultural evolution , manuscript.
9.
Tatje, Terrence A., and Raoul Naroll1970 "Two measures of societal complexity: an empirical cross-cultural comparison," in Raoul Naroll and Ronald Cohen, eds., A Handbook of Method in Cultural Anthropology, Garden City , Natural History Press: 766-833.