Carl Du Prel

The philosophy of mysticism

George Redway, London 1889.

Joseph Jastrow

The psychology of spiritualism

The Popular Science Monthly, N. 46, Vol. XXXIV, London aprile 1889, pp. 721-732.

Proceedings of the Society for Psychical Research

Vol. 6, London 1889.

Journal of the Society for Psychical Research

Vol. 4, London 1889.

Angelo Lewis Professor Hoffmann

More Magic

George Routledge and sons, London 1890.

John Henry Pepper

The true history of the ghost and all about metempsychosis

Cassel and company, ltd., London 1890.

Jean-Eugéne Robert-Houdin e Joseph Forster

Card sharpers. Their tricks exposed or The art always winning

Spencer Blackett, London 1891.

Scientific Mysteries

Offices of the Chemist and Druggist, London 1891.

Proceedings of the Society for Psychical Research

Vol. 7, London 1891.

Journal of the Society for Psychical Research

Vol. 5, London 1891.