Samuel Astley Durham, History of Denmark, Sweden, and Norway, Volume 3, The cabinet cyclopaedia, p. 317 (Longman, Orme, Brown, Green & Longmans and John Taylor, 1840). Found at Google books. Retrieved September 16, 2010.
Skadi Meic Beorh, Pirate Lingo, Wildside Press LLC: 9, 2009, ISBN 978-1-4344-0510-4 Found at Google books. Retrieved September 16, 2010.
