APA (7e ed.) Bronvermelding

Heinritz, S. F., & Farrell, P. V. (1971). Purchasing: Principles and applications (5th ed.). Prentice-Hall.

Chicago (17e ed.) Bronvermelding

Heinritz, Stuart F., en Paul V. Farrell. Purchasing: Principles and Applications. 5th ed. Englewood Cliffs, N.J: Prentice-Hall, 1971.

MLA (9e ed.) Bronvermelding

Heinritz, Stuart F., en Paul V. Farrell. Purchasing: Principles and Applications. 5th ed. Prentice-Hall, 1971.