Cita APA (7a ed.)

Schaie, K. W., & Willis, S. L. (1991). Adult development and aging (3rd ed.). HarperCollins.

Cita Chicago Style (17a ed.)

Schaie, K. Warner, y Sherry L. Willis. Adult Development and Aging. 3rd ed. New York: HarperCollins, 1991.

Cita MLA (9a ed.)

Schaie, K. Warner, y Sherry L. Willis. Adult Development and Aging. 3rd ed. HarperCollins, 1991.