Cita APA (7th ed.)

Baily, P. (1977). Purchasing principles & techniques (3rd.). Pitman.

Cita Chicago (17th ed.)

Baily, Peter. Purchasing Principles & Techniques. 3rd. London: Pitman, 1977.

Cita MLA (9th ed.)

Baily, Peter. Purchasing Principles & Techniques. 3rd. Pitman, 1977.