APA
Schiffman S., . (2009). Ask questions, get sales : close the deal and create long-term relationships. Avon, Mass: Adams Media Corporation.
Chicago
Schiffman Stephan, . 2009. Ask questions, get sales : close the deal and create long-term relationships. Avon, Mass: Adams Media Corporation.
Harvard
Schiffman S., . (2009). Ask questions, get sales : close the deal and create long-term relationships. Avon, Mass: Adams Media Corporation.
MLA
Schiffman Stephan, . Ask questions, get sales : close the deal and create long-term relationships. Avon, Mass: Adams Media Corporation. 2009.