- A lifetime of richesMichael J. Ritt, Kirk Landers
- Napoleon Hill's positive action planMichael J. Ritt
- Napoleon Hill's Keys to Positive ThinkingNapoleon Hill Foundation, Michael J. Ritt
- Las claves del pensamiento positivoNapoleon Hill, Michael J. Ritt
- Keys to Positive ThinkingMichael J. Ritt
- A lifetime of richesMichael J. Ritt
- Napoleon Hill's Keys to Positive ThinkingNapoleon Hill, Michael J. Ritt
