Osowicka-Kondratowicz, Magdalena. “On Problems of Speech Development – A Study Among Five-Year-Old Children from the City of Olsztyn”. Prace Językoznawcze 25, no. 4 (December 20, 2023): 53–64. Accessed May 15, 2024. https://czasopisma.uwm.edu.pl/index.php/pj/article/view/9351.