Van der Hart, W., & Waller, R. (2013). The end of worry: Why we worry and how to stop (1st Howard Books trade pbk. ed.). Howard Books.
Cita Chicago Style (17a ed.)Van der Hart, Will, y Rob Waller. The End of Worry: Why We Worry and How to Stop. 1st Howard Books trade pbk. ed. New York: Howard Books, 2013.
Cita MLA (8a ed.)Van der Hart, Will, y Rob Waller. The End of Worry: Why We Worry and How to Stop. 1st Howard Books trade pbk. ed. Howard Books, 2013.
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