Der Streit über die Tragödie

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

Increasing Personal Efficiency

Applied Psychology: Making Your Own World Being the Second of a Series of Twelve Volumes on the Applications of Psychology to the Problems of Personal and Business Efficiency

Euripides and His Age

The Birth of Tragedy; or, Hellenism and Pessimism

Applied Psychology: Driving Power of Thought Being the Third in 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

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

Increasing Human Efficiency in Business A Contribution to the Psychology of Business