WALĘCKA-MATYJA, Katarzyna Kamila. Psychological study of siblings subsystems – methodological considerations. Quarterly Journal Fides et Ratio, [S. l.], v. 57, n. 1, p. 67–75, 2024. DOI: 10.34766/fetr.v57i1.1253. Disponível em: https://fidesetratio.com.pl/ojs/index.php/FetR/article/view/1253. Acesso em: 2 aug. 2025.