Παραπομπή APA

Gupta, P. (2005). six sigma performance handbook: A statistical guide to optimizing results. McGraw-Hill.

Παραπομπή Chicago Style

Gupta, Praveen. Six Sigma Performance Handbook: A Statistical Guide to Optimizing Results. USA: McGraw-Hill, 2005.

Παραπομπή MLA

Gupta, Praveen. Six Sigma Performance Handbook: A Statistical Guide to Optimizing Results. McGraw-Hill, 2005.