Bajak, Monika. “Selected Determinants of Children’s Helpfulness at the Early School Age on the Basis of Selected Schools in Myslenice County (Poland)”. Journal of Vasyl Stefanyk Precarpathian National University 5, no. 1 (April 20, 2018): 162–167. Accessed December 22, 2024. https://journals.pnu.edu.ua/index.php/jpnu/article/view/3549.