http://www.fangraphs.com/library/index.php/war/

http://www.fangraphs.com/library/index.php/war/war-position-players/

http://www.fangraphs.com/library/index.php/war/calculating-war-pitchers/

http://www.fangraphs.com/library/index.php/war/differences-fwar-rwar/