Ferdinand II was king of Aragon and king of Castile from 1479. He united the Spanish kingdoms into the nation of Spain and supported Columbus's exploration.
Ferdinand II. (2013). The Biography Channel website. Retrieved 07:33, May 24, 2013, from http://www.biography.com/people/ferdinand-ii-40528.
Ferdinand II. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/ferdinand-ii-40528 [Accessed 24 May 2013].
"Ferdinand II." 2013. The Biography Channel website. May 24 2013, 07:33 http://www.biography.com/people/ferdinand-ii-40528.
"Ferdinand II," The Biography Channel website, 2013, http://www.biography.com/people/ferdinand-ii-40528 [accessed May 24, 2013].
"Ferdinand II," The Biography Channel website, http://www.biography.com/people/ferdinand-ii-40528 (accessed May 24, 2013).
Ferdinand II [Internet]. The Biography Channel website; 2013 [cited 2013 May 24] Available from: http://www.biography.com/people/ferdinand-ii-40528.
Ferdinand II, http://www.biography.com/people/ferdinand-ii-40528 (last visited May 24, 2013).
Ferdinand II. The Biography Channel website. 2013. Available at: http://www.biography.com/people/ferdinand-ii-40528. Accessed May 24, 2013.