Boyd, H. W., Westfall, R. L., & Stasch, S. F. (1981). Marketing Research: Text and cases. R.D. Irwin.
Cita Chicago (17th ed.)Boyd, Harper W., Ralph L. Westfall, i Stanley F. Stasch. Marketing Research: Text and Cases. Homewood, Ill.: R.D. Irwin, 1981.
Cita MLA (9th ed.)Boyd, Harper W., et al. Marketing Research: Text and Cases. R.D. Irwin, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.