Cieciuch, J., Hulak, A., Kitaj, M., Leszczyńska, J., & Bulkowska, D. (2011). Circular structure of values in preschool children. Studia Psychologica: Theoria Et Praxis, 11(2), 5–18. Retrieved from https://czasopisma.uksw.edu.pl/index.php/sp/article/view/2755