APA (7th ed.) Citation

Corey, E. R., Lovelock, C. H., & Ward, S.. (1981). Problems in marketing (6th ed.). McGraw-Hill.

Chicago Style (17th ed.) Citation

Corey, E. Raymond, Christopher H. Lovelock, and Scott Ward. Problems in Marketing. 6th ed. New York: McGraw-Hill, 1981.

MLA (9th ed.) Citation

Corey, E. Raymond, et al. Problems in Marketing. 6th ed. McGraw-Hill, 1981.