APA (7e ed.) Bronvermelding

Heinritz, S. F., & Farrell, P. V. (1981). Purchasing: Principles and applications. Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Heinritz, Stuart F., en Paul V. Farrell. Purchasing: Principles and Applications. Englewood Cliffs, N. J: Prentice-Hall, 1981.

MLA (9e ed.) Bronvermelding

Heinritz, Stuart F., en Paul V. Farrell. Purchasing: Principles and Applications. Prentice-Hall, 1981.