Dyfyniad APA

Newman, H. H., Freeman, F. N., & Holzinger, K. J. (1937). Twins: A study of heredity and environment. The University of Chicago Press.

Dyfyniad Arddull Chicago

Newman, Horatio Hackett, Frank N. Freeman, and Karl J. Holzinger. Twins: A Study of Heredity and Environment. Chicago, Ill.: The University of Chicago Press, 1937.

Dyfyniad MLA

Newman, Horatio Hackett, et al. Twins: A Study of Heredity and Environment. The University of Chicago Press, 1937.

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