Celka, Zbigniew. “Relics of Cultivation in the Vascular Flora of Medieval West Slavic Settlements and Castles”. Biodiversity: Research and Conservation 22 (October 20, 2011): 1–110. Accessed June 30, 2024. https://pressto.amu.edu.pl/index.php/biorc/article/view/v10119-011-0011-0.