ユーカタストロフ
ISBN 978-1-4724-1370-3。https://books.google.com/books?id=1UaiAgAAQBAJ&q=eucatastrophe+deus+ex+machina+tolkien&pg=PT280。7September 2014閲覧。
↑ Mazur 2011, p. 175
↑ Magill, Frank (1983). Survey of modern fantasy literature (First ed.). Salem Press. p. 2065. ISBN 978-0893564506. https://books.google.com/books?id=qQ7w2AHr2xAC&q=eucatastrophe 2014年9月8日閲覧。
↑ Template:ME-ref/SOLOPOVA
↑ Carpenter, Humphrey, ed (1981). The Letters of J. R. R. Tolkien. with the assistance of Christopher Tolkien. Boston: Houghton Mifflin. pp. Letter No. 89. ISBN 0-395-31555-7