By His Bootstraps (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "By His Bootstraps" in English language version.

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archive.org

"Contents". Astounding Science Fiction. October 1941. p. 5.
Gale, Floyd C. (December 1960). "Galaxy's 5 Star Shelf". Galaxy Science Fiction. pp. 123–127.

jstor.org

David Lewis (April 1976). "The Paradoxes of Time Travel". American Philosophical Quarterly 13:2. pp. 145–152. JSTOR 20009616.

nytimes.com

Sagan, Carl (1978-05-28). "Growing up with Science Fiction". The New York Times. p. SM7. ISSN 0362-4331. Retrieved 2018-12-12.

web.archive.org

heinleinarchives.net

worldcat.org

search.worldcat.org

Sagan, Carl (1978-05-28). "Growing up with Science Fiction". The New York Times. p. SM7. ISSN 0362-4331. Retrieved 2018-12-12.