Walęcka-Matyja, Katarzyna. “Loneliness and Coping With Stress in People Raised As Only Children and People With Siblings in Early Adulthood”. Kwartalnik Naukowy Fides et Ratio 37, no. 1 (March 30, 2019): 137–157. Accessed January 2, 2026. https://fidesetratio.com.pl/ojs/index.php/FetR/article/view/37.