Robert Heinlein - By His Bootstraps

Length: Short Story (Three-Fifty Pages)
Full text(PDF) : http://pot.home.xs4all.nl/scifi/byhisbootstraps.pdf
Wikipedia article: http://en.wikipedia.org/wiki/By_His_Bootstraps
ISFDB Biography: http://www.isfdb.org/cgi-bin/title.cgi?46440