Wikipedia - Provides a history and plot lines. - http://en.wikipedia.org/wiki/Victorious_Boxers
GameFAQs - A walk through by BlitzRonin. Contains back story and match assistance. - http://www.gamefaqs.com/console/ps2/file/447803/42580
GameSpot - Reviewed by: Ryan Mac Donald, score 8.5/10. "The best video game interpretation of the sport of boxing ever made." - http://www.gamespot.com/ps2/sports/victoriousboxers/