by W.R. Trask, Princeton University Press, 1969* C. W. Leadbeater, "Man, Visible and Invisible"* Sheila Ostrander and Lynn Schroeder "Psychic Discoveries Behind the Iron Curtain", Englewood Cliffs, New Jersey: Prentice Hall, 1970.
by W.R. Trask, Princeton University Press, 1969* C. W. Leadbeater, "Man, Visible and Invisible"* Sheila Ostrander and Lynn Schroeder "Psychic Discoveries Behind the Iron Curtain", Englewood Cliffs, NJ: Prentice-Hall Inc., 1970.