APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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