Editing 15 puzzle (section)

==References==
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*{{Citation | last1=Archer | first1=Aaron F. | title=A modern treatment of the 15 puzzle | mr=1732661  | year=1999 | journal=[[American Mathematical Monthly|The American Mathematical Monthly]] | issn=0002-9890 | volume=106 | issue=9 | pages=793–799 | doi=10.2307/2589612| jstor=2589612 | citeseerx=10.1.1.19.1491 }}
*{{Citation | last1=Johnson | first1=Wm. Woolsey | last2=Story | first2=William E. | title=Notes on the "15" Puzzle | year=1879 | journal=[[American Journal of Mathematics]] | issn=0002-9327 | volume=2 | issue=4 | pages=397–404 | jstor=2369492 | doi=10.2307/2369492}}
* Edward Kasner & James Newman (1940) [[Mathematics and the Imagination]], pp 177&ndash;80, [[Simon & Schuster]].
* {{ cite book | last1 = Slocum | first1 = Jerry | last2 = Singmaster | first2 = David | title = The Cube: The Ultimate Guide to the World's Best-Selling Puzzle—Secrets, Stories, Solutions | publisher = [[Black Dog & Leventhal Publishers|Black Dog & Leventhal]] | year = 2009 | ISBN = 978-1579128050 }}
*{{Citation | last1=Wilson | first1=Richard M. | title=Graph puzzles, homotopy, and the alternating group | doi=10.1016/0095-8956(74)90098-7  | mr=0332555  | year=1974 | journal=Journal of Combinatorial Theory, Series B | issn=0095-8956 | volume=16 | pages=86–96| doi-access=free }}
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