Cita APA (7th ed.)

Schaie, K. W., & Willis, S. L. (1996). Adult development and aging (4th ed.). Harper Collins College.

Cita Chicago (17th ed.)

Schaie, K. Warner, i Sherry L. Willis. Adult Development and Aging. 4th ed. New York: Harper Collins College, 1996.

Cita MLA (9th ed.)

Schaie, K. Warner, i Sherry L. Willis. Adult Development and Aging. 4th ed. Harper Collins College, 1996.