Heinritz, S. F., & Farrell, P. V. (1965). Purchasing: Principles and applications (4th ed.). Prentice-Hall.
Chicago Style (17. basım) AtıfHeinritz, Stuart F., ve Paul V. Farrell. Purchasing: Principles and Applications. 4th ed. Englewood Cliffs, N. J: Prentice-Hall, 1965.
MLA (9th ed.) AtıfHeinritz, Stuart F., ve Paul V. Farrell. Purchasing: Principles and Applications. 4th ed. Prentice-Hall, 1965.
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