Bukaciński, D. et al. 2020. Wetland birds of middle Vistula River during breeding season: the impact of human activities on the distribution, abundance and richness of species. Studia Ecologiae et Bioethicae. 18, 5 (Dec. 2020), 335–348. DOI:https://doi.org/10.21697/seb.2020.18.5.30.