Burzyńska, Bożena. “Gratitude Contemplation As a Method to Improve Human Well-Being and Physical Functioning: Theoretical Review of Existing Research”. Journal of Education, Health and Sport 8, no. 3 (March 14, 2018): 298–311. Accessed May 27, 2024. https://apcz.umk.pl/JEHS/article/view/5364.