APA (6th ed.):
ProCon.org. (2010, May 25). UPDATED: Vaccines ProCon.org. Retrieved from https://www.procon.org/updated-vaccines-procon-org/
[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 May 25, 2010. https://www.procon.org/updated-vaccines-procon-org/.
MLA (8th ed.):
ProCon.org, "UPDATED: Vaccines ProCon.org." ProCon.org. 25 May 2010, www.procon.org/updated-vaccines-procon-org/
[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 May 25, 2010. Accessed January 18, 2021. https://www.procon.org/updated-vaccines-procon-org/