Kittel, Piotr. “The Prehistoric Human Impact on Slope Development at the Archaeological Site in Smólsk (Kuyavian Lakeland)”. Bulletin of Geography. Physical Geography Series, no. 8 (July 25, 2015): 107–122. Accessed June 29, 2025. https://apcz.umk.pl/BOGPGS/article/view/7035.