APA (7th ed.) Citation

Rickard, M. (2020). Polypodium s.s: A review of all known cultivars and and species worldwide (Second edition.). British Pteridological Society.

Chicago Style (17th ed.) Citation

Rickard, Martin. Polypodium S.s: A Review of All Known Cultivars and and Species Worldwide. Second edition. London, England: British Pteridological Society, 2020.

MLA (9th ed.) Citation

Rickard, Martin. Polypodium S.s: A Review of All Known Cultivars and and Species Worldwide. Second edition. British Pteridological Society, 2020.