Piwowarczyk, Renata. “Orobanche Alba Subsp. Alba and Subsp. Major (Orobanchaceae) in Poland: Current Distribution, Taxonomy, Plant Communities, Hosts, and Seed Micromorphology”. Biodiversity: Research and Conservation 26 (November 30, 2012): 23–38. Accessed July 18, 2024. https://pressto.amu.edu.pl/index.php/biorc/article/view/v10119-012-0005-6.