WATKINS, Philip C.; WOODWARD, Kathrane; STONE, Tamara. Gratitude and happiness: Development of a measure of gratitude, and relationships with subjective well-being.. Social Behavior and Personality. Roč. 2003, čís. 31. Dostupné online.
psu.edu
citeseerx.ist.psu.edu
WOOD, Alex M.; MALTBY, John; STEWART, Neil. Conceptualizing gratitude and appreciation as a unitary personality trait.. Personality and Individual Differences. 2008, čís. 44. Dostupné online.
web.archive.org
MCCULLOUGH, Michael E.; EMMONS, Robert A.; TSANG, Jo-Ann. The grateful disposition: A conceptual and empirical topography.. Journal of Personality and Social Psychology. 2002, čís. 82. Dostupné v archivu pořízeném dne 2020-07-28.Archivováno 28. 7. 2020 na Wayback Machine.
