Gilliver, Peter; Marshall, Jeremy; Weiner, Edmund (2006). The Ring of Words: Tolkien and the Oxford English Dictionary. Oxford University Press. ISBN 978-0-19-861069-4.
Gilliver, Peter; Marshall, Jeremy; Weiner, Edmund (2006). The Ring of Words: Tolkien and the Oxford English Dictionary. Oxford University Press. ISBN 978-0-19-861069-4.