Wnuk, Marcin, Jerzy T. Marcinkowski, and Zdzisława Kalisz. 2010. “Relationships Between the Strengths of Character: Forgiveness, Gratitude, and Hope and Satisfaction With Life Among Public Health and Physiotherapy Students”. Polish Journal of Public Health 120 (2): 158-62. https://czasopisma.umlub.pl/pjph/article/view/2127.