References
As of 1 May 2012, this article is derived in whole or in part from Farris, Paul W.; Neil T. Bendle; Phillip E. Pfeifer; David J. Reibstein (2010). Marketing Metrics: The Definitive Guide to Measuring Marketing Performance.. The copyright holder has licensed the content utilized under CC-By-SA and GFDL. All relevant terms must be followed.
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