http://ageofex.marinersmuseum.org/

http://www.thepirateking.com/ships/ship_types.htm

http://www.ageofsail.net/aoshipty.asp

http://www.christopher-columbus.eu/ships-crew.htm

http://www.fordham.edu/halsall/source/columbus1.asp

http://www.fordham.edu/halsall/source/columbus1.html

http://library.thinkquest.org/J002678F/columbus.htm