APA-viite (7. p.)
Kean, D., & Cowpe, C. (2008). How to win friends and influence profits: The art of winning more business from your clients. Cyan.
Chicago-viite (17. p.)
Kean, David, ja Chris Cowpe. How to Win Friends and Influence Profits: The Art of Winning More Business from Your Clients. London: Cyan, 2008.
MLA-viite (9. p.)
Kean, David, ja Chris Cowpe. How to Win Friends and Influence Profits: The Art of Winning More Business from Your Clients. Cyan, 2008.
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