APA (7th ed.) Citation

Gygi, C., Williams, B., & Gustafson, T. (2006). Six sigma workbook for dummies. Wiley.

Chicago Style (17th ed.) Citation

Gygi, Craig, Bruce Williams, and Terry Gustafson. Six Sigma Workbook for Dummies. Hoboken, NJ: Wiley, 2006.

MLA (9th ed.) Citation

Gygi, Craig, et al. Six Sigma Workbook for Dummies. Wiley, 2006.