The Happiness Project, Tenth Anniversary Edition by Gretchen Rubin

The Happiness Project, Tenth Anniversary Edition : Paperback : HarperCollins Publishers Inc : 9780062888747 : 0062888749 : 27 Dec 2018 : "A hardcover edition of this book was published in 2009 by HarperCollins Publishers; first Harper Paperbacks published 2011"-- Title page verso.