Saturday Morning Cartoons - Hanna-Barbera Productions, Inc., also variously known as H-B Enterprises, H-B Production Co., and Hanna-Barbera Cartoons, Inc., was an American animation studio and production company founded in 1957 by
Hanna-Barbera: The Architects of Saturday Morning
Yabba Dabbo Doo!: Inside Hanna-Barbera and "TV's First Cartoon for Grownups" - LIFE