HEIMAN STEPHEN E. (1998). NEW STRATEGIC SELLING. WARNER BOOK.
Chicago Style aipamenaHEIMAN STEPHEN E. NEW STRATEGIC SELLING. NEW YORK: WARNER BOOK, 1998.
MLA aipamenaHEIMAN STEPHEN E. NEW STRATEGIC SELLING. WARNER BOOK, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.