This is a chart to show the publishing history of editions of works about this subject. Along the X axis is time, and on the y axis is the count of editions published. Click here to skip the chart.Reset chart or continue zooming in. This graph charts editions published on this subject.
![The happiness hypothesis [electronic resource]](http://covers.openlibrary.org/b/id/7293585-M.jpg "The happiness hypothesis [electronic resource]")
