Society for Psychical Research (Great Britain), Society for Psychical Research (London, England), Henry Sidgwick, Balfour Stewart, Arthur James Balfour Balfour (Earl of) (1912). “Presidential Addresses to the Society for Psychical Research, 1882-1911”
Michael Faraday, Sir William CROOKES (1860). “A course of six lectures on the various forces of Matter, and their relations to each other ... Edited by W. Crookes. With numerous illustrations”, p.3
Society for Psychical Research (Great Britain), Society for Psychical Research (London, England), Henry Sidgwick, Balfour Stewart, Arthur James Balfour Balfour (Earl of) (1912). “Presidential Addresses to the Society for Psychical Research, 1882-1911”