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 (2009), Pirate Lingo, ISBN978-1-4344-0510-4, Wildside Press LLC, p. 9 Found at Google books. Retrieved September 16, 2010.
gutenberg.org
Charles Ellms, The Pirates Own Book, (c. 1837). Found at Gutenberg books online. Retrieved September 16, 2010.