MCGUIRE, A. P.; ERICKSON, T. M.; QUACH, C. M.; WILLEY, B. Gratitude for Better or Worse: Differential Predictors and Affective Outcomes of State Gratitude in Positive and Negative Contexts. Journal of Positive Psychology and Wellbeing, v. 3, n. 2, p. 99-111, 15 Oct. 2018.