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

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

Studies in the Psychology of Sex, Volume 1 / The Evolution of Modesty; The Phenomena of Sexual Periodicity; Auto-Erotism

The Development Psychology of Psychopathology

Studies in the Psychology of Sex, Volume 4 / Sexual Selection In Man

Studies in the Psychology of Sex, Volume 2 / Sexual Inversion