IGN.com - Dreamcast cheat codes and reader reviews. - http://dreamcast.ign.com/objects/013/013377.html
Infogrames - Official publisher's site, with features, screen shots, and discussion forum. - http://www.us.infogrames.com/games/xtremesports_gbc/
All Game Guide - Dreamcast version information, including screen shots, description, review, instructions, and developer credits. - http://www.allgame.com/cg/agg.dll?p=agg&SQL=GIH%7C%7C%7C%7C26763
GameSpot - Game Boy Color coverage including screen shots, review, news, and cheat codes. - http://www.gamespot.com/gbc/sports/xtremesports/