http://www.gamewinners.com/playstation2/GranTurismo3.htm

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http://www.megagames.com/news/show.cgi?&idtype=cheats&database=249&section=comments&

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http://www.gamerevolution.com/review/ps2/gran-turismo-3-a-spec

http://www.psxextreme.com/scripts/reviews2/review.asp?revID=61

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http://www.gamespot.com/ps2/driving/granturismo3aspec/hints.html

http://www.playstation2-cheats.co.uk/your_cheats.php?4406

http://ps2.gamezone.com/gzreviews/r16748.htm

http://www.gamefaqs.com/console/ps2/code/197470.html

http://www.psx2codes.com/granturismo3.html

http://wiki.answers.com/Q/Where_can_you_find_cheats_for_Grand_Turismo_4_for_PS2