- L'Engle, Madeleine. A Wrinkle in Time. Toronto: Crosswicks, Ltd., 1962.
- "Madeleine L'Engle." May 24, 2019. <https://www.madeleinelengle.com/>.
- Biography.com Editors. "Madeleine L'Engle." Biography.com. April 2, 2014. May 24, 2019. <https://www.biography.com/writer/madeleine-lengle>.
- Atlas, Nava. "Madeleine L'Engle." Literary Ladies Guide. March 6, 2018. May 24, 2019. <https://www.literaryladiesguide.com/author-biography/lengle-madeleine/>.
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