| Breaking the Cost Barrier | Ruffa, Stephen A. | John Wiley |
| Going Lean | Ruffa, Stephen A. | Amacom Books |
| Going Lean | Ruffa, Stephen A. | Brilliance Audio |
| Going Lean | Ruffa, Stephen A. | Brilliance Audio Lib Edn |
| Going Lean | Ruffa, Stephen A. | Brilliance Audio |
| Going Lean | Ruffa, Stephen A. | Brilliance Audio Lib Edn |
