Cita APA (7th ed.)
Hawkins, D. I., & Tull, D. S. (1993). Essentials of marketing research (6th ed.). Macmillan.
Cita Chicago (17th ed.)
Hawkins, Del I., i Donald S. Tull. Essentials of Marketing Research. 6th ed. New York: Macmillan, 1993.
Cita MLA (9th ed.)
Hawkins, Del I., i Donald S. Tull. Essentials of Marketing Research. 6th ed. Macmillan, 1993.
Atenció: Aquestes cites poden no estar 100% correctes.