Jones, R. E. (1991). A literature guide to A wrinkle in time by Madeline L'Engle. Book Wise.
Lua i Stíl Chicago (17ú heag.)Jones, Raymond E. A Literature Guide to A Wrinkle in Time by Madeline L'Engle. Cambridge: Book Wise, 1991.
Lua MLA (9ú heag.)Jones, Raymond E. A Literature Guide to A Wrinkle in Time by Madeline L'Engle. Book Wise, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.