Rumbauskas, F. J. (2007). Selling Sucks How to Stop Selling and Start Getting Prospects to Buy. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Rumbauskas, Frank J. Selling Sucks How to Stop Selling and Start Getting Prospects to Buy. John Wiley & Sons, 2007.
Lua MLA (8ú heag.)Rumbauskas, Frank J. Selling Sucks How to Stop Selling and Start Getting Prospects to Buy. John Wiley & Sons, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.