HEIMAN STEPHEN E. (2004). NEW STRATEGIC SELLING. KOGAN PAGE.
Lua i Stíl Chicago (17ú heag.)HEIMAN STEPHEN E. NEW STRATEGIC SELLING. LONDON: KOGAN PAGE, 2004.
Lua MLA (9ú heag.)HEIMAN STEPHEN E. NEW STRATEGIC SELLING. KOGAN PAGE, 2004.
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