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  • Aaronson, Lauren. "Make a Gratitude Adjustment." Psychology Today. Reviewed Nov. 17, 2008. (June 1, 2009)http://www.psychologytoday.com/articles/index.php?term=20060227-000004&page=1
  • Emmons, Robert A. "Thanks!" Houghton Mifflin Harcourt. 2007. (June 1, 2009)http://books.google.com/books?id=tGCcH2l4jUUC
  • George Mason University "Key To Happiness Is Gratitude, And Men May Be Locked Out." ScienceDaily. March 19, 2009. (June 1, 2009)http://www.sciencedaily.com­ /releases/2009/03/090313145939.htm
  • Kent State University. "Want To Be Happier? Be More Grateful." ScienceDaily. Nov. 27, 2008. (June 1, 2009)http://www.sciencedaily.com­ /releases/2008/11/081125113005.htm
  • Watkins, Philip C. "Gratitude and Subjective Well-Being." The Psychology of Gratitude. Oxford University Press U.S. 2004. (June 1, 2009)http://books.google.com/books?id=Qz4nhZ3ZMmgC&client=firefox-a