Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Kumar, V., David A. Aaker, y George S. Day. Essentials of Marketing Research. New York (N.Y.) [etc.]: John Wiley & Sons, 1999.

Cita MLA (9a ed.)

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