William Lindsay Gresham

Fortune Tellers Never Starve

Coronet, N. 4, Vol. 27, febbraio 1950, pp. 169-172.

William Henry Salter

'An Adventure' A Note on the Evidence

Journal of the Society for Psychical Research, London gennaio 1950.

Montague Summers

The Physical Phenomena of Mysticism

Barnes & Noble, New York 1950.