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SYUKRON, Amin. (2013). Six sigma: quality for business improvement . Jakarta: Graha Ilmu.

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SYUKRON, Amin. Six sigma: quality for business improvement. Jakarta: Graha Ilmu, 2013. Text.

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SYUKRON, Amin. Six sigma: quality for business improvement. Jakarta: Graha Ilmu, 2013. Print.