Gaya APA

Burka, J, B., Yuen, L, M. (1983). Procrastination; why yo do it, what to do about it . USA: Addison-Wesley Publishing Company.

Gaya MLA

Burka, Jane, B.., Yuen, Lenora, M.. "Procrastination; why yo do it, what to do about it". USA: Addison-Wesley Publishing Company, 1983. Text.