Clifford, C. (2013).  Let''s close a deal: Turn contacts into paying customers for your company, product, service or cause.  John Wiley & Sons.

 Clifford, Christine.  Let''s Close a Deal: Turn Contacts Into Paying Customers for Your Company, Product, Service or Cause.  John Wiley & Sons, 2013.

 Clifford, Christine.  Let''s Close a Deal: Turn Contacts Into Paying Customers for Your Company, Product, Service or Cause.  John Wiley & Sons, 2013.