HEIMAN STEPHEN E. (1985). STRATEGIC SELLING. WILLIAM MORROW.
Lua i Stíl Chicago (17ú heag.)HEIMAN STEPHEN E. STRATEGIC SELLING. NEW YORK: WILLIAM MORROW, 1985.
Lua MLA (9ú heag.)HEIMAN STEPHEN E. STRATEGIC SELLING. WILLIAM MORROW, 1985.
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