イフ (雑誌)
Ashley, Mike (2005). Transformations: The Story of the Science Fiction Magazines from 1950 to 1970. Liverpool: Liverpool University Press. ISBN 0-85323-779-4.
Robinson, Frank M. (1999). Science Fiction of the 20th Century: An Illustrated History. New York: Barnes & Noble. ISBN 0-7607-6572-3.
Tuck, Donald H. (1982). The Encyclopedia of Science Fiction and Fantasy: Volume 3. Chicago: Advent: Publishers, Inc.. ISBN 0-911682-26-0.
Nicholls, Peter (1979). The Encyclopedia of Science Fiction. St Albans: Granada Publishing. ISBN 0-586-05380-8.