World Book — Columbus, Christopher (Archive.is saytida 2012-12-03 sanasida arxivlangan) „Columbus, Christopher“. World Book Store has the encyclopedia, dictionary, atlas, homework help, study aids, and curriculum guides. 2010
britannica.com
Christopher Columbus Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 8-iyun 2010-yil.
google.co.uk
books.google.co.uk
Hoxie, Frederic {{subst:FULLPAGENAME}} Encyclopedia of North American Indians Houghton Mifflin (March 1997) ISBN 978-0-395-66921-1 p.568 [1][sayt ishlamaydi][sayt ishlamaydi]
World Book — Columbus, Christopher (Archive.is saytida 2012-12-03 sanasida arxivlangan) „Columbus, Christopher“. World Book Store has the encyclopedia, dictionary, atlas, homework help, study aids, and curriculum guides. 2010