Ławski, Jarosław. “Celebrating the 70th Birthday of Jan Leończuk, Bialystok, 24 June 2020. Report”. Bibliotekarz Podlaski 51, no. 2 (August 16, 2021): 313–319. Accessed April 26, 2024. https://bibliotekarzpodlaski.pl/index.php/bp/article/view/617.