Cita APA (7a ed.)

Willerman, L. (1979). The psychology of individual and group differences. W. H. Freeman.

Cita Chicago Style (17a ed.)

Willerman, Lee. The Psychology of Individual and Group Differences. San Francisco: W. H. Freeman, 1979.

Cita MLA (9a ed.)

Willerman, Lee. The Psychology of Individual and Group Differences. W. H. Freeman, 1979.