Philip IV was the King of Spain and Portugal during the decline of Spain as a great world power in the 1600's.
King Philip IV. (2013). The Biography Channel website. Retrieved 04:06, Jun 19, 2013, from http://www.biography.com/people/philip-iv-39076.
King Philip IV. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/philip-iv-39076 [Accessed 19 Jun 2013].
"King Philip IV." 2013. The Biography Channel website. Jun 19 2013, 04:06 http://www.biography.com/people/philip-iv-39076.
"King Philip IV," The Biography Channel website, 2013, http://www.biography.com/people/philip-iv-39076 [accessed Jun 19, 2013].
"King Philip IV," The Biography Channel website, http://www.biography.com/people/philip-iv-39076 (accessed Jun 19, 2013).
King Philip IV [Internet]. The Biography Channel website; 2013 [cited 2013 Jun 19] Available from: http://www.biography.com/people/philip-iv-39076.
King Philip IV, http://www.biography.com/people/philip-iv-39076 (last visited Jun 19, 2013).
King Philip IV. The Biography Channel website. 2013. Available at: http://www.biography.com/people/philip-iv-39076. Accessed Jun 19, 2013.