You never need to include one when citing journal articles, e-books, or other stable online sources.

http://mottcc.instructure.com/eportfolios/299/Nandrobol_375_Mg_Rs
http://yc.instructure.com/eportfolios/16683/Burnabol_150_Mg_Tabletta
http://loyolahs.instructure.com/eportfolios/827/Femalefil_10_Mg_Naproxen


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