Wróblewska, I., Z. Wróblewska, and S. Manulik. “Quality of Life of Elderly People With Gastrointestinal Malignant Tumors”. Journal of Education, Health and Sport, vol. 9, no. 3, Mar. 2019, pp. 85-96, https://apcz.umk.pl/JEHS/article/view/6654.