APA-referens (7:e uppl.)

COOPER DONALD R. (2009). BUSINESS RESEARCH METHODS. TATA MCGRAW-HILL.

Chicago-referens (17:e uppl.)

COOPER DONALD R. BUSINESS RESEARCH METHODS. NEW DELHI: TATA MCGRAW-HILL, 2009.

MLA-referens (9:e uppl.)

COOPER DONALD R. BUSINESS RESEARCH METHODS. TATA MCGRAW-HILL, 2009.