HEIMAN STEPHEN E. (1998). NEW STRATEGIC SELLING. KOGAN PAGE.
Lua i Stíl Chicago (17ú heag.)HEIMAN STEPHEN E. NEW STRATEGIC SELLING. UK: KOGAN PAGE, 1998.
Lua MLA (9ú heag.)HEIMAN STEPHEN E. NEW STRATEGIC SELLING. KOGAN PAGE, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.