Gran Turismo 4: Prologue International Releases - Giant Bomb

Gran Turismo 4: Prologue is a racing game developed by Polyphony Digital and released in Japan, Southeast Asia and Europe. The game was never released in North America, for reasons unknown.

Gran Turismo 4 Prologue, Gran Turismo Wiki

Gran Turismo (Franchise) - Giant Bomb

Gran Turismo 4 Prologue, Gran Turismo Wiki

Gran Turismo 4: Prologue International Releases - Giant Bomb

Gran Turismo 4 (Game) - Giant Bomb

Gran Turismo 4: Prologue (2003) - MobyGames

Gran Turismo 4 International Releases - Giant Bomb

News - March, 2022

What are the UK's biggest Gran Turismo games?, UK Time Tunnel

Damage Modelling in Gran Turismo 6 “Similar to GT5” – GTPlanet