References
1. David Colbert, The Magical Worlds of Harry Potter, p 195, ISBN 0-9708442-0-4
2. The Magician's Wand: A History of Mystical Rods of Power by Joe Lantiere ISBN 0962769525 http://isbndb.com/d/book/the_magicians_wand.html
3. Francis James Child, The English and Scottish Popular Ballads, v 1, p 315-6, Dover Publications, New York 1965