APA aipamena

Heinritz, S. F., & Farrell, P. V. (1981). Purchasing: Principles and applications (6th ed.). Prentice-Hall.

Chicago Style aipamena

Heinritz, Stuart F., and Paul V. Farrell. Purchasing: Principles and Applications. 6th ed. Englewood Cliffs, N.J: Prentice-Hall, 1981.

MLA aipamena

Heinritz, Stuart F., and Paul V. Farrell. Purchasing: Principles and Applications. 6th ed. Prentice-Hall, 1981.