doi:10.1088/0004-6256/149/3/106 Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. Trigonometric Parallaxes for 1507 Nearby
Cambridge University Press. 2013. ISBN 978-1-107-72910-0. Dasent, Arthur Irwin. Piccadilly in Three Centuries: With Some Account of Berkeley Square and
2001. ISBN 0-88135-388-4. Amundsen, Roald. The South Pole, Vol. II. London: John Murray. 1912. Berton, Pierre. The Arctic Grail. New York: Viking Penguin
Corporation Irwin, Robert, The Arabian Nights: A Companion, Tauris Parke Paperbacks: 65, 2003, ISBN 1-86064-983-1 Haddawy 1990:VIII Irwin 1994:31-32 Irwin 1994:38-39