Gratitude Works! A 21–Day Program for Creating Emotional Prosperity : A 21-Day Program for Creating Emotional Prosperity Emmons, Robert A. 9781118131299 Innbundet 01.04.2013 Engelsk I salg
The Psychology of Gratitude McCullough, Michael E. Emmons, Robert A. 9780195150100 Series in Affective Science Innbundet 18.03.2004 Engelsk I salg
