Official site. Features a history of the game, archive of the rules, news, and details on various editions.

A brief history of the game.

Features distributor information, inventory of contents, and photos of two editions of the game, including the Swedish version.

Encyclopedia article about the game. Features rules, question categories and colors, history of the game, and details of the Columbo controversy.

Article by Juan Rodriquez about writing 50,000 questions for 20 editions of the game.

Describes the decline of the game.