Trębacz A. Articulation disorders of the sigmatism type and the level of self-esteem of students completing the stage of early school education. Own research conducted in the Greater Poland region. ikps [Internet]. 15 grudzień 2020 [cytowane 19 kwiecień 2024];(30):187–222. Dostępne na: https://pressto.amu.edu.pl/index.php/ikps/article/view/27063