http://www-05.ibm.com/ch/presentations/cmo_study/pdf/CMO_Erkenntnisse_Susanne_Marty_IBM.pdf
Source : http://www.emarketing-b2b.com/Seven-most-important...
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Seven most important measures of ROI B2B marketing success
Source : http://www.emarketing-b2b.com/Seven-most-important...
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