- ^ "Newbery Medal and Honor Books, 1922–Present". American Library Association. 1999-11-30. Retrieved May 9, 2013.
- ^ On-line biography of George Selden, The Educational Paperback Association, archived from the original on 2006-04-23.
- ^ Woolery, George W. (1989). Animated TV Specials: The Complete Directory to the First Twenty-Five Years, 1962-1987. Scarecrow Press. pp. 99–100. ISBN 0-8108-2198-2.
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