APA (6th ed.):
ProCon.org. (2013, July 30). Historical Timeline: History of Euthanasia and Physician-Assisted Suicide. Retrieved from https://www.procon.org/historical-timeline-history-of-euthanasia-and-physician-assisted-suicide/
[Editor's Note: The APA citation style requires double spacing within entries.]
Chicago (17th ed.):
ProCon.org, "Historical Timeline: History of Euthanasia and Physician-Assisted Suicide," ProCon.org. last modified July 30, 2013. https://www.procon.org/historical-timeline-history-of-euthanasia-and-physician-assisted-suicide/.
MLA (8th ed.):
ProCon.org, "Historical Timeline: History of Euthanasia and Physician-Assisted Suicide." ProCon.org. 30 July 2013, www.procon.org/historical-timeline-history-of-euthanasia-and-physician-assisted-suicide/
[Editor’s Note: The MLA citation style requires double spacing within entries.]
Turabian (8th ed.):
ProCon.org. "Historical Timeline: History of Euthanasia and Physician-Assisted Suicide." ProCon.org. Last modified on July 30, 2013. Accessed January 15, 2021. https://www.procon.org/historical-timeline-history-of-euthanasia-and-physician-assisted-suicide/