Παραπομπή APA

Boyd, H. W., & Westfall, R. S. (1977). Marketing research: Text and cases (4th ed.). Richard D. Irwin.

Παραπομπή Chicago Style

Boyd, Harper W., και Ralph Stasch Westfall. Marketing Research: Text and Cases. 4th ed. Illinois: Richard D. Irwin, 1977.

Παραπομπή MLA

Boyd, Harper W., και Ralph Stasch Westfall. Marketing Research: Text and Cases. 4th ed. Richard D. Irwin, 1977.