Chapman, E. N. (1992). Sales training basics (3rd ed.). Crisp.
Lua i Stíl Chicago (17ú heag.)Chapman, Elwood N. Sales Training Basics. 3rd ed. Los Altos, Calif.: Crisp, 1992.
Lua MLA (9ú heag.)Chapman, Elwood N. Sales Training Basics. 3rd ed. Crisp, 1992.
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