Key, W. M. E. (1920). Heredity and social fitness: A study of differential mating in a Pennsylvania family. The Carnegie institution of Washington.
Chicago-Zitierstil (17. Ausg.)Key, Wilhelmine Marie Enteman. Heredity and Social Fitness: A Study of Differential Mating in a Pennsylvania Family. Washington: The Carnegie institution of Washington, 1920.
MLA-Zitierstil (9. Ausg.)Key, Wilhelmine Marie Enteman. Heredity and Social Fitness: A Study of Differential Mating in a Pennsylvania Family. The Carnegie institution of Washington, 1920.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.