Cita APA (7th ed.)

Engel, J. F., Warshaw, M. R., & Kinnear, T. C. (1991). Promotional strategy: Managing the marketing communications process (7th ed.). Irwin.

Cita Chicago (17th ed.)

Engel, James F., Martin R. Warshaw, i Thomas C. Kinnear. Promotional Strategy: Managing the Marketing Communications Process. 7th ed. Burr Ridge, Ill: Irwin, 1991.

Cita MLA (9th ed.)

Engel, James F., et al. Promotional Strategy: Managing the Marketing Communications Process. 7th ed. Irwin, 1991.