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Baran, Roger J, Galka, Rober J., Strunk, Daniel P.. (2008). Principles of customer relationship management . s.l.: Thomson South-Western.

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Baran, Roger J, Galka, Rober J., Strunk, Daniel P.. Principles of customer relationship management. s.l.: Thomson South-Western, 2008. Text.

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Baran, Roger J, Galka, Rober J., Strunk, Daniel P.. Principles of customer relationship management. s.l.: Thomson South-Western, 2008. Text.

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Baran, Roger J, Galka, Rober J., Strunk, Daniel P.. Principles of customer relationship management. s.l.: Thomson South-Western, 2008. Print.