Gaya APA

dkk., S, F, S. (1986). Purchasing : Principles and Applications (Ed. Ketujuh). united states: Prentice-Hall.

Gaya MLA

dkk., Susanti, Faipri, Selegi,. "Purchasing : Principles and Applications". Ed. Ketujuh united states: Prentice-Hall, 1986. Text.