APA استشهاد

Kerr, J. R., & Littlefield, J. E. (1974). Marketing: An environemental approach. Prentice-Hall of India.

استشهاد بنمط شيكاغو

Kerr, John R., و James E. Littlefield. Marketing: An Environemental Approach. New Jersey: Prentice-Hall of India, 1974.

MLA استشهاد

Kerr, John R., و James E. Littlefield. Marketing: An Environemental Approach. Prentice-Hall of India, 1974.