Manifestations of the spirit!

Tait's Edinburgh Magazine, Sutherland and Knox, Edinburgh 1853, pp. 157-164.

Gwendolyn Kelley Hack

The Direct Voice in Italy (1 of 2)

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

Gwendolyn Kelley Hack

The Direct Voice in Italy (2 of 2)

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

Theodore Besterman

Review of Modern Psychic Mysteries book

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

Carlos S. Alvarado

Investigating Mental Mediums: Research Suggestions from the Historical Literature

Journal of Scientific Exploration, N. 2, Vol. 24, Virginia Beach 2010, pp. 197-224.