Rickard, M. (2020). Polypodium s.s: A review of all known cultivars and and species worldwide (Second edition.). British Pteridological Society.
Chicago-Zitierstil (17. Ausg.)Rickard, Martin. Polypodium S.s: A Review of All Known Cultivars and and Species Worldwide. Second edition. London, England: British Pteridological Society, 2020.
MLA-Zitierstil (9. Ausg.)Rickard, Martin. Polypodium S.s: A Review of All Known Cultivars and and Species Worldwide. Second edition. British Pteridological Society, 2020.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.