Gaya APA

K., S, C., R., S, D. (1990). Life-Span Human Development (Trawas) . California: Brooks/oe Publihing Company.

Gaya MLA

K., Sigelman, Carol., R., Shaffer, David. "Life-Span Human Development (Trawas)". California: Brooks/oe Publihing Company, 1990. Text.