R. D. Adams

Exposing Houdini’s Tricks of Magic

Modern Mechanix, noviembre 1929, pp. 104-108.

Gwendolyn Kelley Hack

The Direct Voice in Italy (1 of 2)

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

Gwendolyn Kelley Hack

The Direct Voice in Italy (2 of 2)

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