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:Recursion, ''see Recursion''.<ref name=Hunter>{{cite book|last=Hunter|first=David|title=Essentials of Discrete Mathematics|year=2011|publisher=Jones and Bartlett|pages=494|url=https://books.google.com/books?id=kuwhTxCVovQC&q=recursion+joke|isbn=9781449604424}}</ref>
A variation is found on page 269 in the [[Back-of-the-book index|index]] of some editions of [[Brian Kernighan]] and [[Dennis Ritchie]]'s book ''[[The C Programming Language]]''; the index entry recursively references itself ("recursion 86, 139, 141, 182, 202, 269"). Early versions of this joke can be found in ''Let's talk Lisp'' by Laurent Siklóssy (published by Prentice Hall PTR on December 1, 1975, with a copyright date of 1976) and in ''Software Tools'' by Kernighan and Plauger (published by Addison-Wesley Professional on January 11, 1976). The joke also appears in ''The UNIX Programming Environment'' by Kernighan and Pike. It did not appear in the first edition of ''The C Programming Language''. The joke is part of the [[functional programming]] folklore and was already widespread in the functional programming community before the publication of the aforementioned books. <ref name="Grainger College">{{cite web |last1=Shaffer |first1=Eric |title=CS 173:Discrete Structures |url=https://courses.engr.illinois.edu/cs173/sp2009/Lectures/lect_19.pdf |publisher=University of Illinois at Urbana-Champaign |access-date=7 July 2023}}</ref>
[[File:Toronto recursive history plaque.jpg|thumb|A plaque commemorates the Toronto Recursive History Project of Toronto's Recursive History.]]
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