Gaya APA

Hayler, R., Nichols, M, D. (2007). Six sigma for financial services : how leading companies are driving results with lean, six sigma, and process management . New York: McGraw Hill.

Gaya MLA

Hayler, Rowland., Nichols, Michael, D.. "Six sigma for financial services : how leading companies are driving results with lean, six sigma, and process management". New York: McGraw Hill, 2007. Text.