Philip of Swabia was a German Hohenstaufen king who engaged in warfare against the emperor Otto IV over the crown for a decade in late 1100's.
of Swabia Philip. (2013). The Biography Channel website. Retrieved 11:55, May 19, 2013, from http://www.biography.com/people/philip-39627.
of Swabia Philip. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/philip-39627 [Accessed 19 May 2013].
"of Swabia Philip." 2013. The Biography Channel website. May 19 2013, 11:55 http://www.biography.com/people/philip-39627.
"of Swabia Philip," The Biography Channel website, 2013, http://www.biography.com/people/philip-39627 [accessed May 19, 2013].
"of Swabia Philip," The Biography Channel website, http://www.biography.com/people/philip-39627 (accessed May 19, 2013).
of Swabia Philip [Internet]. The Biography Channel website; 2013 [cited 2013 May 19] Available from: http://www.biography.com/people/philip-39627.
of Swabia Philip, http://www.biography.com/people/philip-39627 (last visited May 19, 2013).
of Swabia Philip. The Biography Channel website. 2013. Available at: http://www.biography.com/people/philip-39627. Accessed May 19, 2013.