- ^ a b "The book of three". LC Online Catalog. Library of Congress (lccn.loc.gov). Retrieved 2015-11-02.
- ^ a b Lloyd Alexander Interview Transcript Archived 2011-10-03 at the Wayback Machine (1999). Interview with Scholastic students. Scholastic Inc. Retrieved 2011-12-17.
- ^ About the author (1973). The Foundling and Other Tales of Prydain, Henry Holt and Company, first edition, page [87].
- ^ Tunnell, Michael O. (1989). The Prydain Companion: A Reference Guide to Lloyd Alexander's Prydain Chronicles. New York: Henry Holt and Company. ISBN 0805072713. Retrieved 24 March 2020.
- ^ Bird, Elizabeth (July 7, 2012). "Top 100 Chapter Book Poll Results". A Fuse #8 Production. Blog. School Library Journal (blog.schoollibraryjournal.com). Retrieved 2015-11-02.
- ^ a b c d Fisher, Margery (1983). "Review of the Book of Three". Children's Literature Review. 5. Retrieved 6 April 2020.
- ^ "The Book of Three". School Library Journal. 61 (1): 61. January 2015. Retrieved 6 April 2020.
- ^ Kois, Dan (October 19, 2010). "The Black Cauldron". Slate. The Slate Group. Retrieved 24 March 2020.
- ^ McNary, Dave (March 17, 2016). "'Chronicles of Prydain' Movie in the Works at Disney". Variety. Variety Media. Retrieved 24 March 2020.
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