↑ Giant star, entry in Astronomy Encyclopedia, ed. Patrick Moore, New York: Oxford University Press, 2002. ISBN 0-19-521833-7.
↑ supergiant, entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight, David Darling, on line, accessed May 15, 2007.
↑ hypergiant, entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight, David Darling, on line, accessed May 15, 2007.
↑ Giant star, entry in Cambridge Dictionary of Astronomy, Jacqueline Mitton, Cambridge: Cambridge University Press, 2001. ISBN 0-521-80045-5.
↑ giant, entry in The Facts on File Dictionary of Astronomy, ed. John Daintith and William Gould, New York: Facts On File, Inc., 5th ed., 2006. ISBN 0-8160-5998-5.
