APA (6th ed.):
ProCon.org. (2008, February 28). William Norman Guthrie. Retrieved from https://undergod.procon.org/source-biographies/william-norman-guthrie/
[Editor's Note: The APA citation style requires double spacing within entries.]
Chicago (17th ed.):
ProCon.org, "William Norman Guthrie," ProCon.org. last modified February 28, 2008. https://undergod.procon.org/source-biographies/william-norman-guthrie/.
MLA (8th ed.):
ProCon.org, "William Norman Guthrie." ProCon.org. 28 Feb. 2008, undergod.procon.org/source-biographies/william-norman-guthrie/
[Editor’s Note: The MLA citation style requires double spacing within entries.]
Turabian (8th ed.):
ProCon.org. "William Norman Guthrie." ProCon.org. Last modified on February 28, 2008. Accessed January 28, 2021. https://undergod.procon.org/source-biographies/william-norman-guthrie/