Churchill, G. A., Ford, N. M., & Walker, O. C. (1997). Sales force management (5th ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Churchill, Gilbert A., Neil M. Ford, agus Orville C. Walker. Sales Force Management. 5th ed. Chicago: Irwin, 1997.
Lua MLA (8ú heag.)Churchill, Gilbert A., et al. Sales Force Management. 5th ed. Irwin, 1997.
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