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Tohutoru Kātū Chicago (17th ed.)aly, essam mohamoud, me tawfekm mohamed hassan ; supervisor. Application of Six Sigma. cairo: {l.n}, 2008.
Tohutoro MLA (9th ed.)aly, essam mohamoud, me tawfekm mohamed hassan ; supervisor. Application of Six Sigma. {l.n}, 2008.
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