Gaya APA

Wolfe, D, L., Tharp, R, G. (2001). Self-directed Behavior ; Self-modification For Personal Adjustment (Trawas) . California: Brooks/Cole Publishing Company.

Gaya MLA

Wolfe, David, L.., Tharp, Roland, G.. "Self-directed Behavior ; Self-modification For Personal Adjustment (Trawas)". California: Brooks/Cole Publishing Company, 2001. Text.