APA استشهاد

AAker, D. a. . D. (1980). Marketing research (2 Edition.).

استشهاد بنمط شيكاغو

AAker, David and Day. Marketing Research. 2 Edition. John Wiely & Sons, New York, 1980.

MLA استشهاد

AAker, David and Day. Marketing Research. 2 Edition. 1980.