Churchill, G. A. J., Ford, N. M., & Walker, O. C. J. (1985). Sales force management: Planning, implementation, and control (2ª ed.). Richard D. Irwin.

Churchill, Gilbert A. Jr, Neil M. Ford, and Orville C. Jr Walker. Sales Force Management: Planning, Implementation, and Control. 2ª ed. Illinois: Richard D. Irwin, 1985.

Churchill, Gilbert A. Jr, et al. Sales Force Management: Planning, Implementation, and Control. 2ª ed. Richard D. Irwin, 1985.