Al and Michael's Digimon Site: Codes.
Ampereo's Digimon Home Page: Cheats, chats, profiles, tips and pictures.
Digimon: Secrets, attack ratings and an adopted digimon.
Digimon Cheats: Cheats and secrets.
Digimon Sekai: Digivolving guide, game information, walkthroughs, and screenshots.
Digimonsources: FAQ, cards, images, links, and codes.
GameSpot: Digimon Digital Card Battle: Game information and review [5.1/10].
The Digimon Hotel: Provides cheats, hints and links.