If an article is not available through the library, and you can't get it by other means such as:
then you may want to try a commercial document delivery service.
This is a good option only if you're sure that you really need this article in particular, because it costs money. The price includes the royalties that go to the copyright owner plus a service charge.
Different services have different articles available as well as different charges and delivery times. Most services deliver your article electronically, by emailing you a link to the PDF file, or emailing you the document as an attachment.