Rozdział: Social competencies of children at preschool age / Bożena Grzeszkiewicz. - // W: Perspectives of pre-primary and primary education : challenges and strategies / Ondřej Šimik, Joanna Skibska (editors) ; University of Ostrava. Faculty of Education.. - Ostrava ; Bielsko-Biała : Ostravská univerzita. Pedagogická fakulta ; ATH, 2019 (WorkId 22707)