R. Hattatt Collection and Richard Hattatt. Ancient Brooches and Other Artefacts: A Fourth Selection of Brooches Together with Some Other Antiquities from the Author's Collection
. Oxford: Oxbow Publishing, 1989. p. 63.
Wixom, William D., ed. Mirror of the Medieval World. New York: The Metropolitan Museum of Art, 1999. no. 13, p. 18.