| The Judas Strain LP: A Sigma Force Novel | ||
| The Last Oracle (Sigma Force) Audio CD | ||
| The Six Sigma Yellow Belt Handbook | ||
| Bloodline: A Sigma Force Novel Paperback | ||
| The Devil Colony: A Sigma Force Novel | ||
| Lean Six Sigma | SUMMERS, Donna C. | |
| The Sixth Extinction (Sigma Force) | ||
| The Sixth Extinction (Sigma Force) | ||
| The Demon Crown (Sigma Force) | ||
| The Six Sigma Handbook, Fourth Edition | ||
| Wat is Lean Six Sigma? | Dave Rowlands | Uitgeverij Thema |
| Lean Six Sigma Demystified, Second Edition | ||
| Six Sigma Statistics with Excel and Minitab | ||
| Statistics for Six Sigma Made Easy | ||
| Het Sigma protocol | Robert Ludlum | Poema Pocket |
| Het Sigma protocol | Robert Ludlum | Poema Pocket |
| Het Sigma protocol | Robert Ludlum | Poema Pocket |
| Het Sigma Protocol | Robert Ludlum | Luitingh |
| The Sixth Extinction (Sigma Force) | ||
| The Six Sigma Leader | Pande, Peter S. |
