↑ World Book – Columbus, Christopher "Columbus, Christopher". World Book Store has the encyclopedia, dictionary, atlas, homework help, study aids, and curriculum guides. 2010
↑ Hoxie, Frederic E. ed. Encyclopedia of North American Indians Houghton Mifflin (Mar 1997) ISBN 978-0-395-66921-1 p.568ใ
↑ Herbst, Philip The Color of Words: An Encyclopaedic Dictionary of Ethnic Bias in the United States Intercultural Press Inc (31 December 1997) ISBN 978-1-877864-97-1 p.116
↑ Wilton, David; Brunetti, Ivan Word myths: debunking linguistic urban legends Oxford University Press USA (13 January 2005) ISBN 978-0-19-517284-3 pp.164–165
