- Soares, Manuela (2003). A Reading Guide to A Wrinkle in Time. Scholastic BookFiles. ISBN 0-439-46364-5.
- Chase, Carole F. (1998). Suncatcher: A study of Madeleine L'Engle and her writing. Innisfree Press. p. 170. ISBN 1-880913-31-3.
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