Clifford, C. (2013). Let's close a deal: Turn contacts into paying customers for your company, product, service or cause. Wiley.
Chicago-referens (17:e uppl.)Clifford, Christine. Let's Close a Deal: Turn Contacts into Paying Customers for Your Company, Product, Service or Cause. Hoboken, New Jersey: Wiley, 2013.
MLA-referens (8:e uppl.)Clifford, Christine. Let's Close a Deal: Turn Contacts into Paying Customers for Your Company, Product, Service or Cause. Wiley, 2013.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.