APA-referens (7:e uppl.)

ZIKMUND I , B. C. (2013). BUSINESS RESEARCH METHODS (9TH.). CENGAGE.

Chicago-referens (17:e uppl.)

ZIKMUND I , BABIN CARR. BUSINESS RESEARCH METHODS. 9TH. NEW DELHI: CENGAGE, 2013.

MLA-referens (9:e uppl.)

ZIKMUND I , BABIN CARR. BUSINESS RESEARCH METHODS. 9TH. CENGAGE, 2013.