Hermsen, Elizabeth J. et al.: Azolla Sporophytes and Spores from the Late Cretaceous and Paleocene of Patagonia, Argentina. International Journal of Plant Sciences, 19.07.2019, 180. vsk, nro 7, s. 737–754. The University of Chicago Press. doi:10.1086/704377ISSN 1058-5893Artikkelin verkkoversio. Viitattu 12.2.2021. (englanniksi)
”Floating aquatic macrophytes – Azolla”, Use Of Algae And Aquatic Macrophytes As Feed In Small-Scale Aquaculture. A Review: FAO Fisheries And Aquaculture Technical Paper No. 531. Rooma: Food and Agriculture Organization of the United Nations, 2010. ISBN 978-92-5-106420-7Luku PDF-muodossa Viitattu 12.2.2021. (englanniksi)
Hermsen, Elizabeth J. et al.: Azolla Sporophytes and Spores from the Late Cretaceous and Paleocene of Patagonia, Argentina. International Journal of Plant Sciences, 19.07.2019, 180. vsk, nro 7, s. 737–754. The University of Chicago Press. doi:10.1086/704377ISSN 1058-5893Artikkelin verkkoversio. Viitattu 12.2.2021. (englanniksi)
worldcat.org
Hermsen, Elizabeth J. et al.: Azolla Sporophytes and Spores from the Late Cretaceous and Paleocene of Patagonia, Argentina. International Journal of Plant Sciences, 19.07.2019, 180. vsk, nro 7, s. 737–754. The University of Chicago Press. doi:10.1086/704377ISSN 1058-5893Artikkelin verkkoversio. Viitattu 12.2.2021. (englanniksi)
