Marks, R. B. (1997). Personal selling: A relationship approach (6th ed.). Prentice Hall.
Chicago Style (17th ed.) CitationMarks, Ronald B. Personal Selling: A Relationship Approach. 6th ed. Upper Saddle River, N.J: Prentice Hall, 1997.
MLA (9th ed.) CitationMarks, Ronald B. Personal Selling: A Relationship Approach. 6th ed. Prentice Hall, 1997.
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