Though his reputation was scarred by his affiliation with the Nazi party, Martin Heidegger is one of the most influential philosophers of the 20th century.
Martin Heidegger. (2013). The Biography Channel website. Retrieved 05:13, May 25, 2013, from http://www.biography.com/people/martin-heidegger-9333549.
Martin Heidegger. [Internet]. 2013. The Biography Channel website. Available from: http://www.biography.com/people/martin-heidegger-9333549 [Accessed 25 May 2013].
"Martin Heidegger." 2013. The Biography Channel website. May 25 2013, 05:13 http://www.biography.com/people/martin-heidegger-9333549.
"Martin Heidegger," The Biography Channel website, 2013, http://www.biography.com/people/martin-heidegger-9333549 [accessed May 25, 2013].
"Martin Heidegger," The Biography Channel website, http://www.biography.com/people/martin-heidegger-9333549 (accessed May 25, 2013).
Martin Heidegger [Internet]. The Biography Channel website; 2013 [cited 2013 May 25] Available from: http://www.biography.com/people/martin-heidegger-9333549.
Martin Heidegger, http://www.biography.com/people/martin-heidegger-9333549 (last visited May 25, 2013).
Martin Heidegger. The Biography Channel website. 2013. Available at: http://www.biography.com/people/martin-heidegger-9333549. Accessed May 25, 2013.