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<referencetext xmlns="http://eprints.org/ep2/data/2.0">CHOWDHURY, Subir (2001) El Poder de Seis Sigma – Prentice may, 151 p.
PLOTKIN, Hal (Mayo/2003) Six Sigma. Qué es y cómo utilizarlo – Harvard Business Review /Management Herald
HARRY, Mikel (2000) The vision of Six Sigma, case studies and applications – Sigma Publishing Company 
BRUE Greg (2002) Seis Sigma para Directivos – McGraw Hill, 232 p.</referencetext>
