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El-Haik, Basem, Roy, David M.. (2005). Service Design For Six Sigma A Road Map For Excelleence . New York: A Wiley-Interscience Publication.

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El-Haik, Basem, Roy, David M.. Service Design For Six Sigma A Road Map For Excelleence. New York: A Wiley-Interscience Publication, 2005. .

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El-Haik, Basem, Roy, David M.. Service Design For Six Sigma A Road Map For Excelleence. New York: A Wiley-Interscience Publication, 2005. .

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El-Haik, Basem, Roy, David M.. Service Design For Six Sigma A Road Map For Excelleence. New York: A Wiley-Interscience Publication, 2005. .