| SIGMA Soft cover notebook (met regels, ruled) A6 | Sigma | |
| The Judas Strain CD: A Sigma Force Novel (Sigma | | |
| The Devil Colony: A SIGMA Force Novel (Sigma | | |
| The Bone Labyrinth: A Sigma Force Novel (Sigma | | |
| The Seventh Plague: A Sigma Force Novel (Sigma | | |
| The Seventh Plague: A Sigma Force Novel (Sigma | | |
| The Seventh Plague: A Sigma Force Novel (Sigma | | |
| The Demon Crown: A Sigma Force Novel (Sigma Force | | |
| The Demon Crown: A Sigma Force Novel (Sigma Force | | |
| The Seventh Plague: A Sigma Force Novel (Sigma | | |
| The Bone Labyrinth: A Sigma Force Novel (Sigma | | |
| Bloodline: A Sigma Force Novel (Sigma Force | | |
| The Eye of God: A Sigma Force Novel (Sigma Force | | |
| Lean Six Sigma: Combining Six Sigma Quality with | | |
| The Six Sigma Project Planner : A Step-by-Step | | |
| Lean Six Sigma for Service : How to Use Lean | | |
| Leading Six Sigma: A Step by Step Guide Based on | | |
| Leading Six Sigma: A Step-by-Step Guide Based on | | |
| The Six Sigma Fieldbook: How DuPont Successfully | | |
| Making Six Sigma Last: Managing the Balance | | |
