This is an example of how you would cite if you have a doi number:
Hobbs, T. (2000). Physicians should treat alcoholism as a disease. In J. Torr (Ed.), Current Controversies:
Alcoholism (pp. 219-223). doi: EJ3010217217.
If your professor requires you to include the URL, then you might cite in this way:
Lyons, J. D. (2006). Winston Churchill and the rhetorical challenges of democratic statesmanship.
Perspectives on Political Science, 35(1), 4-13. Retrieved from http://www.galileo.usg.edu.
For APA style, you would only have the date (year), the source was published or updated and this would come directly after the author's name. If there is no author, then the date is placed after the title of the source.