Frelik, Pawel
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 293-295.
Aires, Nick
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 295-297.
Westfahl, Gary
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 298-299.
Sawyer, Andy
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 300-301.
Barrette, Elizabeth
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 302-304.
Marcinko, Tom
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 304-306.
Effross, Walter A.
Buffalo Law Review 45: 931- . [46 p. from online version) Fall 1997.
Russell, W. M. S.
Folklore 93(1): 3-30. June 1982.
Langford, David
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 306-308.
Schlobin, Roger C.
Fantasy Newsletter 4(12): 6-9, 29. December 1981.
Brusso, Charlene
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 308-310.
Pheasant-Kelly, Frances
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 311-313.
Gaiman, Neil
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. xxxi-xxxii.
Ryder, Mike
The Conversation. September 24, 2021. Online at: 
https://theconversation.com/foundation-an-introduction-to-five-major-themes-in-the-work-of-science-fiction-writer-isaac-asimov-168608 
Accessed 6 October 2021. 
 
 
 
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Riggs, Don
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 313-315.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 315-317.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 318-320.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 320-322.
Davis, Robert M.
Science-Fiction Studies 12(1): 33-41. March 1985.
Monk, Patricia
Mosaic 17(2): 207-222. Spring 1984.
Snyder, Lucy A.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 322-324.
Kerslake, Patricia
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 325-327.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 327-329.
Johanson, Paula
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 329-331.
Pearson, Wendy G.
in: Westfahl, Gary, ed. The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. Westport, CT: Greenwood, 2005. pp. 331-334.
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