Kumar, V., Aaker, D. A., & Day, G. S. (2002). Essentials of marketing research (2nd ed.). Wiley.
Chicago-viite (17. p.)Kumar, V., David A. Aaker, ja George S. Day. Essentials of Marketing Research. 2nd ed. New York: Wiley, 2002.
MLA-viite (8. p.)Kumar, V., et al. Essentials of Marketing Research. 2nd ed. Wiley, 2002.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.