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Its simple. For example, if an online article titled Citing Sources was written by John Smith in August 2011, and was found on the website http://ProperCitations.com and you researched it for a report on September 3rd 2011, and wanted to quote the 4th paragraph, you could cite it like this:
Smith, John: Citing Sources: [http://ProperCitations.com/Citing_Sources.html]: para. 4: [Sept 3, 2011]