1. NASA (2021, February 17) The Causes of Climate Change. Global Climate Change: Vital Signs of the Planet. https://climate.nasa.gov/causes/
2. Dostler, G. (2017, March 1) 7 Reasons Why Plants Are Valuable and Important. Plantscapers. https://plantscapers.com/7-reasons-why-plants-are-valuable-and-important/
3. Sprunt, S.V., Schneider, H., Watson, L., Russell, S.J., Navarro-Gomez, A. and Hickey, R.J. (2011) Exploring the Molecular Phylogeny and Biogeography of Pleopeltis polypodioides (Polypodiaceae, Polypodiales) Inferred from Plastid DNA Sequences. Systematic Botany, 36, 862-869.
4. Taylor, A. (2017, May 18) Resurrection Fern (Pleopeltis polypodioides)—Island Ecology 2017. Island Ecology. https://sites.google.com/site/islandecology2017/terrestrial-flora/resurrection-fern
5. Revival of respiration and photosynthesis in dried leaves of Polypodium polypodioides