Niceforo Filatete e Vincenzo Scarpa

Annali dello spiritismo in Italia

Vol. 27-28, Tipografia A. Baglione, Torino 1890.

Journal of the Society for Psychical Research

Vol. 5, London 1891.

Proceedings of the Society for Psychical Research

Vol. 7, London 1891.

Edmund Gurney, Frederic William Henry Myers, e Frank Podmore

Les hallucinations télépathiques

Félix Alcan, Paris 1891.