Article on a website
Twilley, Nicola, and Cynthia Graber. "Kelp is the New Kale." The Atlantic, 13 Sep. 2016, www.theatlantic.com/science/archive/2016/09/gastropod-seaweed499760/.
Page on a website with no individual author
"PTSD Basics." PTSD: National Center for PTSD, United States, Department of Veterans Affairs, 27 May 2016, www.ptsd.va.gov/public/PTSD-overview/basics/index.asp.
NOTE: The date of access is an optional element. If your instructor wants you to include it, place it at the end of the citation. E.g.: Accessed 22 Sept. 2019.