Mohammed, The Prophet of Islam

Self-Development and the Way to Power

Myths and Legends of All Nations / Famous Stories from the Greek, German, English, Spanish, / Scandinavian, Danish, French, Russian, Bohemian, Italian / and other sources

Human, All Too Human: A Book for Free Spirits

Three Contributions to the Theory of Sex

Studies in the Psychology of Sex, Volume 5 / Erotic Symbolism; The Mechanism of Detumescence; The Psychic State in Pregnancy