Gaya APA

Whitbourne, S, K., Whitbourne, S, B. (2019). Adult Development and Aging : Biopsychosocial Perspectives 6'th Ed. (6). NewJersey: John Wiley & Sons.

Gaya MLA

Whitbourne, Susan, Kraus., Whitbourne, Stacey, B.. "Adult Development and Aging : Biopsychosocial Perspectives 6'th Ed.". 6 NewJersey: John Wiley & Sons, 2019. Text.