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BERMAN, SAUL J.. (2011). NOT FOR FREE: Revenue Strategies For A New World (cetakan ke 1). AMERIKA: HARVARD BUSINESS REVIEW PRESS.

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BERMAN, SAUL J.. NOT FOR FREE: Revenue Strategies For A New World. cetakan ke 1 AMERIKA: HARVARD BUSINESS REVIEW PRESS, 2011. Text.

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BERMAN, SAUL J.. NOT FOR FREE: Revenue Strategies For A New World. cetakan ke 1 AMERIKA: HARVARD BUSINESS REVIEW PRESS, 2011. Text.

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BERMAN, SAUL J.. NOT FOR FREE: Revenue Strategies For A New World. cetakan ke 1 AMERIKA: HARVARD BUSINESS REVIEW PRESS, 2011. Print.