Bails' Who's Who; The Cartoonist Book, Background About Mort Walker, https://www.cartoonistgroup.com/properties/template_about.php?id=180 (retrieved 27 January 2018); and Mort Walker's Private Scrapbook: Celebrating a Life of Love and Laughter (Andrews McMeel Publishing), December 2000. (Internet citation) (Bails' Who's Who)