Vajda, V; McLoughlin, S. (2005). «A new Maastrichtian-Paleocene Azolla species from of Bolivia, with a comparison of the global record of coeval Azolla microfossils». Alcheringa: an Australasian Journal of Palaeontology. 29 (2): 305–329. doi:10.1080/03115510508619308
In: Encyclopédie Méthodique, Botanique 1(1): 343. 1783. «Name - Azolla Lam.». Tropicos. Saint Louis, Missouri: Missouri Botanical Garden. Consultado em 19 de fevereiro de 2010. Annotation: a sp. nov. reference for Azolla filiculoides Type Specimens HT: Azolla filiculoides