^Drout, Michael D. C. J.R.R. Tolkien encyclopedia: scholarship and critical assessment. CRC Press. 2007. ISBN 978-0-415-96942-0.
^Tolkien, John and Tolkien, Priscilla: The Tolkien Family Album, p. 68
^Wayne G. Hammond et Christina Scull, The J.R.R. Tolkien Companion and Guide: Reader's Guide, Houghton Mifflin, 2006 ,(ISBN 978-0-618-39101-1), p. 202-204