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Tampubolon,Robert. (2005). Risk And Systems-Based Internal Auditing (cet.1). Jakarta: Elex Media Komputindo.

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Tampubolon,Robert. Risk And Systems-Based Internal Auditing. cet.1 Jakarta: Elex Media Komputindo, 2005. Text.

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Tampubolon,Robert. Risk And Systems-Based Internal Auditing. cet.1 Jakarta: Elex Media Komputindo, 2005. Text.

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Tampubolon,Robert. Risk And Systems-Based Internal Auditing. cet.1 Jakarta: Elex Media Komputindo, 2005. Print.