Szkudlarz, Piotr. “Variation in Seed Morphology in the Genus Erica L. (Ericaceae)”. Biodiversity: Research and Conservation 16 (October 25, 2010): 1–106. Accessed January 8, 2025. https://pressto.amu.edu.pl/index.php/biorc/article/view/v10119-009-0022-2.