APA

Heinritz S. F., . (1951). Purchasing: principles and applications. New York: Prentice-Hall.

Chicago

Heinritz Stuart F, . 1951. Purchasing: principles and applications. New York: Prentice-Hall.

Harvard

Heinritz S. F., . (1951). Purchasing: principles and applications. New York: Prentice-Hall.

MLA

Heinritz Stuart F, . Purchasing: principles and applications. New York: Prentice-Hall. 1951.