William James

Phantasms of the Living (review)

Science, N. 205, Vol. 9, 7 gennaio 1887, pp. 18-20.

Joseph Jastrow

The psychology of spiritualism

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

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.

Gwendolyn Kelley Hack

The Direct Voice in Italy (1 of 2)

Psychic Science, N. 4, Vol. 7, gennaio 1929, pp. 272-330.

Gwendolyn Kelley Hack

The Direct Voice in Italy (2 of 2)

Psychic Science, N. 1, Vol. 8, aprile 1929, pp. 9-26.

Theodore Besterman

Review of Modern Psychic Mysteries book

Journal of the Society for Psychical Research, N. 461, Vol. 26, London gennaio 1930, pp. 10-14.