APA (7th ed.) Citation

Sigma Breakthrough Technologies (Firm) & Zinkgraf, S. A. A. (2006). Six SIGMA--the First 90 Days (1st edition.). Prentice Hall PTR.

Chicago Style (17th ed.) Citation

Sigma Breakthrough Technologies (Firm) and Stephen A Author Zinkgraf. Six SIGMA--the First 90 Days. 1st edition. [Place of publication not identified]: Prentice Hall PTR, 2006.

MLA (9th ed.) Citation

Sigma Breakthrough Technologies (Firm) and Stephen A Author Zinkgraf. Six SIGMA--the First 90 Days. 1st edition. Prentice Hall PTR, 2006.