HEIMAN STEPHEN E. (1998). NEW STRATEGIC SELLING. KOGAN PAGE.
Chicago Style aipamenaHEIMAN STEPHEN E. NEW STRATEGIC SELLING. UK: KOGAN PAGE, 1998.
MLA aipamenaHEIMAN STEPHEN E. NEW STRATEGIC SELLING. KOGAN PAGE, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.