↑ p. 8, The Cambridge Guide to the Constellations, Michael E. Bakich, Cambridge University Press, 1995, ISBN0521449219.
↑ entry for "culmination", p. 110, The Facts on File Dictionary of Astronomy, John Daintith, William Gould, Infobase Publishing, 2009, ISBN1438109326.
↑ Entry for "meridian", p. 993, The National Enyclopaedia, library edition, vol. 9, London: William Mackenzie, 69 Ludgate Hill, E.C.; Edinburgh and Glasgow. [1879?-81?]
