https://www.flickr.com/photos/wardomatic/sets/72157620589818001/
http://pequenhaciudad.blogspot.com.es/2012/05/abner-graboff-rey-de-las-cosas.html
https://fishinkblog.wordpress.com/2012/05/28/abner-graboff-quirky-childrens-illustrator/
http://wardomatic.blogspot.com.es/2009/06/art-life-of-abner-graboff.html
