Cita APA (7th ed.)

BOYD HARPER W. (1990). MARKETING RESEARCH (7.). RICHARD D.IRWIN INC.

Cita Chicago (17th ed.)

BOYD HARPER W. MARKETING RESEARCH. 7. ILLINOIS U.S.A: RICHARD D.IRWIN INC, 1990.

Cita MLA (9th ed.)

BOYD HARPER W. MARKETING RESEARCH. 7. RICHARD D.IRWIN INC, 1990.