Jules Romains

Eyeless Sight: A Study of Extra-Retinal Visoin and the Paroptic Sense

G. P. Putnam's Sons, London 1924.

Proceedings of the Society for Psychical Research

Vol. 34, London 1924.

Margery genuine says Conan Doyle; he scores Houdini

Boston Herald, 26 gennaio 1925.

G.B. Seybold

They Can See with Their Skin

Popular Science Monthly, dicembre 1925, p. 21.

Journal of the Society for Psychical Research

Vol. 22-23, London 1925.

Proceedings of the Society for Psychical Research

Vol. 35, London 1926.

Proceedings of the Society for Psychical Research

Vol. 35, London 1926.