Spiro, R. L., .Stanton, W. J., & .Rich, G. A. (1999). Management of a sales force (11th ed.). Irwin/McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Spiro, Rosann L., William J. .Stanton, agus Gregory A. .Rich. Management of a Sales Force. 11th ed. Boston: Irwin/McGraw-Hill, 1999.
Lua MLA (9ú heag.)Spiro, Rosann L., et al. Management of a Sales Force. 11th ed. Irwin/McGraw-Hill, 1999.
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