APA (7e ed.) Bronvermelding
Schiffman, S. (2008). The 25 sales habits of highly successful salespeople (3rd ed.). Adams Media.
Chicago (17e ed.) Bronvermelding
Schiffman, Stephan. The 25 Sales Habits of Highly Successful Salespeople. 3rd ed. Avon, Mass.: Adams Media, 2008.
MLA (9e ed.) Bronvermelding
Schiffman, Stephan. The 25 Sales Habits of Highly Successful Salespeople. 3rd ed. Adams Media, 2008.
Let op: Deze citaties zijn niet altijd 100% accuraat.