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- Earl Nightingale's The Strangest SecretEarl Nightingale
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- Earl Nightingale's greatest discoveryEarl Nightingale
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- How to Completely Change Your Life in 30 SecondsRobert C. Worstell, Earl Nightingale
- Earl Nightingale Reads Think and Grow RichNapoleon Hill, Earl Nightingale
- Secreto Más ExtrañoEarl Nightingale
- Creative ThinkingEarl Nightingale
- Transformational LivingEarl Nightingale
- How to Completely Change Your Life in 30 Seconds - Part VRobert C. Worstell, Earl Nightingale
