Valerie J. Richard Knerr, 82; co-founded Wham-O, maker of the Hula Hoop and Frisbee. Los Angeles Times. 17 January 2008 [23 January 2019]. (原始内容存档于2024-03-29)
(原始内容存档于2021-04-27). Kyle Wagner. LeapPad Explorer: The Tablet Your Kid Can Use as a Frisbee. Gizmodo. June 30, 2011 [July 17, 2014]. (原始内容存档于2016-08-28). WARREN BUCKLEITNER