Cita APA (7a ed.)

Baily, P., & Farmer, D. (1990). Purchasing principle and management (6th ed.). Pitman.

Cita Chicago Style (17a ed.)

Baily, Petter, y David Farmer. Purchasing Principle and Management. 6th ed. London: Pitman, 1990.

Cita MLA (9a ed.)

Baily, Petter, y David Farmer. Purchasing Principle and Management. 6th ed. Pitman, 1990.