Second Foundation (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Second Foundation" in English language version.

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1books.google.com

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archive.org

Conklin, Groff (1953-11). "Galaxy's 5 Star Shelf". Galaxy Science Fiction, November 1953, p.79. Retrieved from https://archive.org/stream/galaxymagazine-1953-11/Galaxy_1953_11#page/n79/mode/2up.

books.google.com

Gunn, James (1982). Isaac Asimov: The Foundations of Science Fiction (2005 Revised ed.). Oxford University Press. ISBN 0-8108-5420-1.