Britten, Frederick James. Former Clock & Watchmakers and Their Work. New York: Spon & Chamberlain. 1894: 230 [2007-08-08]. (原始内容存档于2020-06-27). Chronometers were not regularly supplied to the Royal Navy till about 1825
New and complete epitome of practical navigation containing all necessary instruction for keeping a ship's reckoning at sea ... to which is added a new and correct set of tables - by J. W. Norie 1828
Andrewes, William J.H. (Ed.): The Quest for Longitude. Cambridge, Mass. 1996
Forbes, Eric G.: The Birth of Navigational Science. London 1974
Jullien, Vincent (Ed.): Le calcul des longitudes: un enjeu pour les mathématiques, l`astronomie, la mesure du temps et la navigation. Rennes 2002
Howse, Derek: Greenwich Time and the Longitude. London 1997
Howse, Derek: Nevil Maskelyne. The Seaman's Astronomer. Cambridge 1989
National Maritime Museum (Ed.): 4 Steps to Longitude. London 1962