Cita APA (7th ed.)

COOPER, D. R. &. O. (2012). BUSINESS RESEARCH METHODS (4TH.).

Cita Chicago (17th ed.)

COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. NEWDELHI, 2012.

Cita MLA (9th ed.)

COOPER, DONALD R. & OTHERS. BUSINESS RESEARCH METHODS. 4TH. 2012.