Cita APA (7a ed.)

Loehlin, J. C., & Nichols, R. C. (1976). Heredity, environment, & personality: A study of 850 sets of twins. Univ. of Texas Press.

Cita Chicago Style (17a ed.)

Loehlin, John C., y Robert C. Nichols. Heredity, Environment, & Personality: A Study of 850 Sets of Twins. Austin, Tex. [u.a.]: Univ. of Texas Press, 1976.

Cita MLA (9a ed.)

Loehlin, John C., y Robert C. Nichols. Heredity, Environment, & Personality: A Study of 850 Sets of Twins. Univ. of Texas Press, 1976.