The Closing of the Frontier

How to Cite "The Closing of the Frontier" from CliffsNotes.com:

CliffsNotes.com. The Closing of the Frontier. 23 Nov 2009
<http://www.cliffsnotes.com/WileyCDA/CliffsReviewTopic/topicArticleId-25238,articleId-25176.html>.

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