Kasprzak, Tomasz. “Empirical Research and Studies on Deafblind People in Poland – a Review from 1991–2020 ”. Disability - Discourses of Special Education, no. 43, Dec. 2021, pp. 44-64, https://czasopisma.bg.ug.edu.pl/index.php/niepelnosprawnosc/article/view/6622.