Komik und Humor: Eine Psychologische-Ästhetische Untersuchung

An Essay on Comedy and the Uses of the Comic Spirit

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

Der Streit über die Tragödie

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

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

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

History of English Humour, Vol. 2

The Beautiful: An Introduction to Psychological Aesthetics

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

Da Loucura e das Manias em Portugal

Studies in jocular literature