Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

Schaie, K. Warner, i Sherry L. Willis. Adult Development and Aging. 3rd ed. New York: Harper/Collins, 1991.

Cita MLA (9th ed.)

Schaie, K. Warner, i Sherry L. Willis. Adult Development and Aging. 3rd ed. Harper/Collins, 1991.