Morgan, R. L. (1988). Professional selling: Practical secrets for successful sales. Crisp.
Lua i Stíl Chicago (17ú heag.)Morgan, Rebecca L. Professional Selling: Practical Secrets for Successful Sales. Los Altos, Calif.: Crisp, 1988.
Lua MLA (9ú heag.)Morgan, Rebecca L. Professional Selling: Practical Secrets for Successful Sales. Crisp, 1988.
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