Canfield, B. R. (1958). Salesmanship; Practice and Problems (3rd ed.). McGraw-Hill.
Chicago Edition CitationCanfield, Bertrand R. Salesmanship; Practice and Problems. 3rd ed. New York: McGraw-Hill, 1958.
ציטוט MLACanfield, Bertrand R. Salesmanship; Practice and Problems. 3rd ed. McGraw-Hill, 1958.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.