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Sources

• "Can Smiling Make You Happy?" Research and Teaching Showcase. Department of Psychology, University of Alberta. April 1998.
  http://web.psych.ualberta.ca/~varn/bc/Kleinke.htm
• Goleman, Daniel. "A Feel-Good Theory: A Smile Affects Mood." The New York Times. July 18, 1989.
  http://www.nytimes.com/1989/07/18/science/a-feel-good-theory-a-smile-affects-mood.html?sec=&spon=&pagewanted=all
• Lienhard, John H. "No. 883: Smiles That Make You Happy." The Engines of Our Ingenuity. University of Houston College of Engineering.
  http://uh.edu/engines/epi883.htm