APA (7e ed.) Bronvermelding
Clay, J. (2003). Selling solutions: How to test, monitor and constantly improve your selling skills. Thorogood.
Chicago (17e ed.) Bronvermelding
Clay, Julian. Selling Solutions: How to Test, Monitor and Constantly Improve Your Selling Skills. London: Thorogood, 2003.
MLA (9e ed.) Bronvermelding
Clay, Julian. Selling Solutions: How to Test, Monitor and Constantly Improve Your Selling Skills. Thorogood, 2003.
Let op: Deze citaties zijn niet altijd 100% accuraat.