Cita APA (7th ed.)

Heinritz, S. F., & Farrell, P. V. (1965). Purchasing: Principles and applications (4th ed.). Prentice-Hall.

Cita Chicago (17th ed.)

Heinritz, Stuart F., i Paul V. Farrell. Purchasing: Principles and Applications. 4th ed. Englewood Cliffs, N. J: Prentice-Hall, 1965.

Cita MLA (9th ed.)

Heinritz, Stuart F., i Paul V. Farrell. Purchasing: Principles and Applications. 4th ed. Prentice-Hall, 1965.