Heiman, S. E., Tuleja, T., & Sanchez, D. (2004). The new conceptual selling (2nd ed.). Warner Business Books, Kogan Page.
Lua i Stíl Chicago (17ú heag.)Heiman, Stephen E., Tad Tuleja, agus Diane Sanchez. The New Conceptual Selling. 2nd ed. New York, NY : India: Warner Business Books, Kogan Page, 2004.
Lua MLA (8ú heag.)Heiman, Stephen E., et al. The New Conceptual Selling. 2nd ed. Warner Business Books, Kogan Page, 2004.
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