S. James Weldon

Twenty Years a Fakir

Gate City Books and Novelty Company, Omaha 1899.

Lew Alexander Harraden

Complete mail course of twenty illustrated lessons in hypnotism

Jackson 1899.

Journal of the Society for Psychical Research

Vol. 9, London 1899.

M. Young

25 lessons in hypnotism. How to become an expert operator

1899.

Alfonso Pappalardo

La telepatia

Ulrico Hoepli, Milano 1977 (I ed. 1899).