- Der Streit über die Tragödie
- Increasing Human Efficiency in Business: A Contribution to the Psychology of Business
- Initiative Psychic Energy: Being the Sixth of a Series of Twelve Volumes on the: Applications of Psychology to the Problems of Personal and: Business Efficiency
- Komik und Humor: Eine Psychologische-Ästhetische Untersuchung
- Power of Mental Imagery: Being the Fifth of a Series of Twelve Volumes on the: Applications of Psychology to the Problems of Personal and: Business Efficiency
- Psychology and Achievement: Being the First of a Series of Twelve Volumes on the Applications of Psychology to the Problems of Personal and Business Efficiency
- The Silence: What It Is and How To Use It
- The Trained Memory: Being the Fourth of a Series of Twelve Volumes on the: Applications of Psychology to the Problems of Personal and: Business Efficiency