SUMI, K. Reliability and construct validity of the Gratitude Questionnaire 6 Item Form (GQ 6) in a sample of Japanese college students. Journal of Positive School Psychology , [S. l.], v. 1, n. 2, p. | 73-84 |, 2017. Disponível em: http://journalppw.com/index.php/JPPW/article/view/11. Acesso em: 13 aug. 2020.