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Ackerman, Forrest J (1997). Forrest J Ackerman's World of Science Fiction. Los Angeles: RR Donnelley & Sons Company. ISBN 1-57544-069-5.

Ashley, Mike (2000). The Time Machines:The Story of the Science-Fiction Pulp Magazines from the beginning to 1950. Liverpool: Liverpool University Press. ISBN 0-85323-865-0.

Ashley, Mike (2007). Gateways to Forever: The Story of the Science-Fiction Magazines from 1970 to 1980. Liverpool: Liverpool University Press. ISBN 978-1-84631-003-4.

Clute, John; Nicholls, Peter (1993). Ensiklopedia Cereka Sains. New York: St. Martin's Press, Inc. ISBN 0-312-09618-6.

Hersey, Harold (1937). Pulpwood Editor. New York: F.A. Stokes.

Williamson, Jack (1977). The Legion of Time. London: Sphere. ISBN 0-7221-9175-8.