Heinritz, S. F., & Farrell, P. V. (1982). Purchasing: Principles and applications (Sixth edition.). National Book Store.
Chicago Style (17th ed.) CitationHeinritz, Stuart F., and Paul V. Farrell. Purchasing: Principles and Applications. Sixth edition. Manila: National Book Store, 1982.
MLA citiranjeHeinritz, Stuart F., and Paul V. Farrell. Purchasing: Principles and Applications. Sixth edition. National Book Store, 1982.
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