Karpiński, Maciej, and Katarzyna Klessa. “The Perception of Non-Native Phonological Categories in Adult-Directed and Infant-Directed Speech: An Experimental Study”. Logopedia Silesiana, no. 9 (December 29, 2020): 1-20. Accessed April 26, 2024. https://journals.us.edu.pl/index.php/LOGOPEDIASILESIANA/article/view/11293.