Cita APA (7th ed.)
Clay, J. (2003). Selling solutions: How to test, monitor and constantly improve your selling skills. Thorogood.
Cita Chicago (17th ed.)
Clay, Julian. Selling Solutions: How to Test, Monitor and Constantly Improve Your Selling Skills. London: Thorogood, 2003.
Cita MLA (9th ed.)
Clay, Julian. Selling Solutions: How to Test, Monitor and Constantly Improve Your Selling Skills. Thorogood, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.