Powell, G. R. (2012). Marketing Calculator: Measuring and Managing Return on Marketing Investment. John Wiley & Sons, Incorporated.
Chicago-Zitierstil (17. Ausg.)Powell, Guy R. Marketing Calculator: Measuring and Managing Return on Marketing Investment. Hoboken: John Wiley & Sons, Incorporated, 2012.
MLA-Zitierstil (9. Ausg.)Powell, Guy R. Marketing Calculator: Measuring and Managing Return on Marketing Investment. John Wiley & Sons, Incorporated, 2012.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.