APA (7th ed.) Citation

Kumar, V., Aaker, D., & Day, G. S. (1999). Essentials of marketing research. Wiley.

Chicago Style (17th ed.) Citation

Kumar, V., David Aaker, and George S. Day. Essentials of Marketing Research. New York: Wiley, 1999.

MLA (9th ed.) Citation

Kumar, V., et al. Essentials of Marketing Research. Wiley, 1999.