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President (Game)
http://www.wikipedia.org/wiki/President_(game)
Encyclopedia entry describing the game in detail including rule variations.
Realbeer.com
http://www.realbeer.com/fun/games/games-353.php
A description of the game and how to play.
Rules of Card Games: President
http://www.pagat.com/climbing/asshole.html
Contains a history of the game and detailed rule set.
The Game of President
http://lynx.dac.neu.edu/n/ncheung/cardgames/president.html
Rules of the game.