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, vol. 37, no. 1, Mar. 2019, pp. 137-5, https://doi.org/10.34766/fetr.v1i37.42.