Sołtys-Lelek, Anna, and Wojciech Gruszka. “Wild Roses and Hawthorns of Urban Area: A Case Study of Piła in Poland”. Biodiversity: Research and Conservation 43 (December 28, 2016): 27–40. Accessed September 27, 2024. https://pressto.amu.edu.pl/index.php/biorc/article/view/biorc-2016-0014.