APA (7e ed.) Bronvermelding

Willis, S. L., & Schaie, K. W. (2021). Handbook of the psychology of aging (Ninth edition.). Academic Press, an imprint of Elsevier.

Chicago (17e ed.) Bronvermelding

Willis, Sherry L., en K. Warner Schaie. Handbook of the Psychology of Aging. Ninth edition. London, United Kingdom: Academic Press, an imprint of Elsevier, 2021.

MLA (9e ed.) Bronvermelding

Willis, Sherry L., en K. Warner Schaie. Handbook of the Psychology of Aging. Ninth edition. Academic Press, an imprint of Elsevier, 2021.