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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.

Gwendolyn Kelley Hack

Modern Psychic Mysteries at Millesimo Castle

Rider, London 1929.

Journal of the Society for Psychical Research

Vol. 25-26, London 1929.

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.

D.J. Lonergan

Slate-secrets: a professional treatise

1930.

Proceedings of the Society for Psychical Research

Vol. 39, London 1930.

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.