Ellis, C. D. (2013). What it takes: Seven secrets of success from the world's greatest professional firms. John Wiley & Sons, Inc.
Chicago-Zitierstil (17. Ausg.)Ellis, Charles D. What It Takes: Seven Secrets of Success from the World's Greatest Professional Firms. Hoboken, New Jersey: John Wiley & Sons, Inc, 2013.
MLA-Zitierstil (9. Ausg.)Ellis, Charles D. What It Takes: Seven Secrets of Success from the World's Greatest Professional Firms. John Wiley & Sons, Inc, 2013.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.