A mook is a publication which is physically similar to a magazine but is intended to remain on bookstore shelves for longer periods than traditional magazines, and is a popular format in Japan. The term is a portmanteau of "magazine" and "book". It was first used in 1971, at a convention of the Fédération Internationale de la Presse Périodique. American examples of mooks include Make and Craft. Source: Wikipedia (en)