Cita APA (7th ed.)
Engel, J. F., Wales, H. G., & Warshaw, M. R. (1971). Promotional strategy (Rev. ed.). R. D. Irwin.
Cita Chicago (17th ed.)
Engel, James F., Hugh G. Wales, i Martin R. Warshaw. Promotional Strategy. Rev. ed. Homewood, Ill.: R. D. Irwin, 1971.
Cita MLA (9th ed.)
Engel, James F., et al. Promotional Strategy. Rev. ed. R. D. Irwin, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.