APA aipamena

Gopalakrishnana, P. (1990). Purchasing and materials management.

Chicago Style aipamena

Gopalakrishnana, P. Purchasing and Materials Management. New Delhi, 1990.

MLA aipamena

Gopalakrishnana, P. Purchasing and Materials Management. 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.