1. Protection Afforded by Sickle-cell Trait Against Subtertian Malarial Infection
2. (1955). Tested intelligence and family size: Methodological and interpretive problems. In Proceedings of the World Population Conference, Rome, 31 August–10 September, 1954, Papers: Vol. VI. New York: United Nations.
3. Intelligence and family size.
4. (1958a). Differential psychology: Individual and group differences in behavior. New York: The Macmillan Company.
5. (1958b). Heredity, environment and the question “How”? Psychological Review, 65, 197–208.