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Syukron, Amin, Kholil, Muhammad. (2013). Six sigma: quality for bussiness improvement . Yogyakarta: Graha Ilmu.

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Syukron, Amin, Kholil, Muhammad. Six sigma: quality for bussiness improvement. Yogyakarta: Graha Ilmu, 2013. Text.

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Syukron, Amin, Kholil, Muhammad. Six sigma: quality for bussiness improvement. Yogyakarta: Graha Ilmu, 2013. Text.

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Syukron, Amin, Kholil, Muhammad. Six sigma: quality for bussiness improvement. Yogyakarta: Graha Ilmu, 2013. Print.