APA (6th ed.):
ProCon.org. (2007, November 2). NEW: Historical Timeline. Retrieved from https://www.procon.org/new-historical-timeline/
[Editor's Note: The APA citation style requires double spacing within entries.]
Chicago (17th ed.):
ProCon.org, "NEW: Historical Timeline," ProCon.org. last modified November 2, 2007. https://www.procon.org/new-historical-timeline/.
MLA (8th ed.):
ProCon.org, "NEW: Historical Timeline." ProCon.org. 2 Nov. 2007, www.procon.org/new-historical-timeline/
[Editor’s Note: The MLA citation style requires double spacing within entries.]
Turabian (8th ed.):
ProCon.org. "NEW: Historical Timeline." ProCon.org. Last modified on November 2, 2007. Accessed January 16, 2021. https://www.procon.org/new-historical-timeline/