APA
Schiffman S., . (1994). The 25 Sales Habits of Highly Successful Salespeople. : Adams Media Corporation.
Chicago
Schiffman Stephan, . 1994. The 25 Sales Habits of Highly Successful Salespeople. : Adams Media Corporation.
Harvard
Schiffman S., . (1994). The 25 Sales Habits of Highly Successful Salespeople. : Adams Media Corporation.
MLA
Schiffman Stephan, . The 25 Sales Habits of Highly Successful Salespeople. : Adams Media Corporation. 1994.