Watkins, P. C., Scheer, J., Ovnicek, M., & Kolts, R. (2006). The debt of gratitude: Dissociating gratitude and indebtedness. Cognition and Emotion, 20, 217-241, doi:10.1080/02699930500172291.
(2010) „Gratitude as moral sentiment: Emotion-guided cooperation in economic exchange”. Emotion10 (2), 289–93. o. DOI:10.1037/a0017883. PMID20364907.
Wood, A. M., Joseph, S., & Maltby, J. (2008). PersonalPages.Manchester.ac.ukArchiválva2011. szeptember 28-i dátummal a Wayback Machine-ben, Gratitude uniquely predicts satisfaction with life: Incremental validity above the domains and facets of the Five Factor Model. Personality and Individual Differences, 45, 49-54.
Wood, A. M., Joseph, S., & Maltby, J. (2008). PersonalPages.Manchester.ac.ukArchiválva2011. szeptember 28-i dátummal a Wayback Machine-ben, Gratitude uniquely predicts satisfaction with life: Incremental validity above the domains and facets of the Five Factor Model. Personality and Individual Differences, 45, 49-54.