Bukaciński, Dariusz, Monika Bukacińska, and Ewelina Mastalerz. 2020. “The Human Pressure on the Middle Vistula River Wildlife: The Number and Distribution of People and Their Activity on the River During the Breeding Season of Birds”. Studia Ecologiae Et Bioethicae 18 (5):379-99. https://doi.org/10.21697/seb.2020.18.5.35.