Florek, Wacław, Stanisław Rudowski, and Kazimierz Szefler. “Palaeo-Valleys in the Region of the Słupia River Mouth”. Quaestiones Geographicae 29, no. 3 (September 23, 2010): 27–36. Accessed May 6, 2024. https://pressto.amu.edu.pl/index.php/qg/article/view/v10117-010-0020-7.