Denny, R. (2001). Selling to win: Tested techniques for closing the sale (Rev. 2nd edition.). Kogan Page.
Lua i Stíl Chicago (17ú heag.)Denny, Richard. Selling to Win: Tested Techniques for Closing the Sale. Rev. 2nd edition. London: Kogan Page, 2001.
Lua MLA (8ú heag.)Denny, Richard. Selling to Win: Tested Techniques for Closing the Sale. Rev. 2nd edition. Kogan Page, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.