* [http://www.yugioh-card.com/japan/lineup/duel_monsters/cotd/ yugioh-card.com/japan/] {{Ruby|CODE OF THE DUELIST|コード・オブ・ザ・デュエリスト}} {{icon|ja}}''Code of the Duelist'' Japanese page
* [http://www.yugioh-card.com/en/products/bp-cotd.html yugioh-card.com/en] ''Code of the Duelist''