Journal of the Society for Psychical Research

Vol. 24, London 1927.

Proceedings of the Society for Psychical Research

Vol. 37, London 1927.

Proceedings of the Society for Psychical Research

Vol. 38, London 1928.

Journal of the Society for Psychical Research

Vol. 25-26, London 1929.

Gwendolyn Kelley Hack

Modern Psychic Mysteries at Millesimo Castle

Rider, London 1929.

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.