APA استشهاد

Turnbull, P. W., & Cunningham, M. T. (1981). International Markeiting and Purchasing.

استشهاد بنمط شيكاغو

Turnbull, Peter W., و Malcolm T. Cunningham. International Markeiting and Purchasing. :, 1981.

MLA استشهاد

Turnbull, Peter W., و Malcolm T. Cunningham. International Markeiting and Purchasing. 1981.