APA (6th ed.):
ProCon.org. (2011, February 23). UPDATED: Vaccines ProCon.org. Retrieved from https://www.procon.org/updated-vaccines-procon-org-2/
[Editor's Note: The APA citation style requires double spacing within entries.]
Chicago (17th ed.):
ProCon.org, "UPDATED: Vaccines ProCon.org," ProCon.org. last modified February 23, 2011. https://www.procon.org/updated-vaccines-procon-org-2/.
MLA (8th ed.):
ProCon.org, "UPDATED: Vaccines ProCon.org." ProCon.org. 23 Feb. 2011, www.procon.org/updated-vaccines-procon-org-2/
[Editor’s Note: The MLA citation style requires double spacing within entries.]
Turabian (8th ed.):
ProCon.org. "UPDATED: Vaccines ProCon.org." ProCon.org. Last modified on February 23, 2011. Accessed January 19, 2021. https://www.procon.org/updated-vaccines-procon-org-2/