Cita APA (7th ed.)

Heinritz, S. F. (1997). Purchasing: Principles and applications (8th international ed.). Jemma.

Cita Chicago (17th ed.)

Heinritz, Stuart F. Purchasing: Principles and Applications. 8th international ed. Cainta, Rizal: Jemma, 1997.

Cita MLA (9th ed.)

Heinritz, Stuart F. Purchasing: Principles and Applications. 8th international ed. Jemma, 1997.