Cita APA (7th ed.)

National Association of Purchasing Agents. (1964). Standardization manual ; a book of principles and practices for purchasing personnel (4th ed.). s.n.

Cita Chicago (17th ed.)

National Association of Purchasing Agents. Standardization Manual ; a Book of Principles and Practices for Purchasing Personnel. 4th ed. New York: s.n, 1964.

Cita MLA (9th ed.)

National Association of Purchasing Agents. Standardization Manual ; a Book of Principles and Practices for Purchasing Personnel. 4th ed. s.n, 1964.