Cita APA (7th ed.)

COOPER D R. (2000). BUSINESS RESEARCH METHODS (6TH.). TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.

Cita Chicago (17th ed.)

COOPER D R. BUSINESS RESEARCH METHODS. 6TH. NEW DELHI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2000.

Cita MLA (9th ed.)

COOPER D R. BUSINESS RESEARCH METHODS. 6TH. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2000.