Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.