^Lemon, Alaina (2017). Technologies for Intuition: Cold War Circles and Telepathic Rays. Univ of California Press. p. 100. ISBN 9780520967458.
^Bleiler, Everett Franklin; Bleiler, Richard (1998). Science-fiction: The Gernsback Years : a Complete Coverage of the Genre Magazines ... from 1926 Through 1936. Kent State University Press. p. 552. ISBN 9780873386043.