Komik und Humor: Eine Psychologische-Ästhetische Untersuchung

L'umorismo

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

Studies in jocular literature

Gedancken von Schertzen

An Essay on Comedy and the Uses of the Comic Spirit

Da Loucura e das Manias em Portugal

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

History of English Humour, Vol. 1 With an Introduction upon Ancient Humour