Gaya APA

Watson, D, L., Tharp, R, G. (1981). Self-directed behavior: self-modification for personal adjustment (3 rd ed.). California: Brooks/Cole Pub..

Gaya MLA

Watson, David, L.., Tharp, Roland, G.. "Self-directed behavior: self-modification for personal adjustment". 3 rd ed. California: Brooks/Cole Pub., 1981. Text.