(en) Sherrilyn Kenyon, The Writer's Digest character naming sourcebook, FW Publications, (lire en ligne), p. 9
(en) Patrick McAleer, Inside the Dark tower series : art, evil, and intertextuality in the Stephen King Novels, McFarland & Company Inc. Publishers, (lire en ligne), p. 18
(en) Robin Furth, Concordance, vol. 2, Scribner, (lire en ligne), p. 1-5