Retrieved 2008-11-09. Cite web URL http://gizmodo.com/gadgets/gadgets/digibank-piggy-and-panda-banks-learn-to-count-239597.php Title DigiBank Piggy and Panda Banks Learn to Count Publisher Gizmodo URL access date 2008-11-09 ↑ "The Accidental Invention: The Origin Of Piggy Banks". Retrieved 2015-10-25. ↑ "Piggy Banks".