Cita APA (7th ed.)

Gopalakrishnan, P. (1990). Purchasing and materials management. Tata McGraw-Hill.

Cita Chicago (17th ed.)

Gopalakrishnan, P. Purchasing and Materials Management. New Delhi: Tata McGraw-Hill, 1990.

Cita MLA (9th ed.)

Gopalakrishnan, P. Purchasing and Materials Management. Tata McGraw-Hill, 1990.