APA استشهاد

Gopalakrishnan, P. (1978). Purchasing strategy: Text and cases. Sterling Publishers.

استشهاد بنمط شيكاغو

Gopalakrishnan, P. Purchasing Strategy: Text and Cases. New Delhi: Sterling Publishers, 1978.

MLA استشهاد

Gopalakrishnan, P. Purchasing Strategy: Text and Cases. Sterling Publishers, 1978.