Happier
2007
Being Happy: You Don't Have to Be Perfect to Lead a Richer, Happier Life : You Don't Have to Be Perfect to Lead a Richer, Happier Life
2010
Pursuit of Perfect (PB)
2009
Even Happier: A Gratitude Journal for Daily Joy and Lasting Fulfillment
2009
La búsqueda de la felicidad
2011
Complete Guide to Being Happier (eBook Bundle)
2011