V Vajda et McLoughlin, S., «A new Maastrichtian-Paleocene Azolla species from Bolivia, with a comparison of the global record of coeval Azolla microfossils», Alcheringa: An Australasian Journal of Palaeontology, vol.29, no2, , p.305–329 (DOI10.1080/03115510508619308, Bibcode2005Alch...29..305V, S2CID128643041)
V Vajda et McLoughlin, S., «A new Maastrichtian-Paleocene Azolla species from Bolivia, with a comparison of the global record of coeval Azolla microfossils», Alcheringa: An Australasian Journal of Palaeontology, vol.29, no2, , p.305–329 (DOI10.1080/03115510508619308, Bibcode2005Alch...29..305V, S2CID128643041)
V Vajda et McLoughlin, S., «A new Maastrichtian-Paleocene Azolla species from Bolivia, with a comparison of the global record of coeval Azolla microfossils», Alcheringa: An Australasian Journal of Palaeontology, vol.29, no2, , p.305–329 (DOI10.1080/03115510508619308, Bibcode2005Alch...29..305V, S2CID128643041)
C.A. Arnold, «A Tertiary Azolla from British Columbia», Contributions from the Museum of. Paleontology, University of Michigan, vol.12, no4, , p.37–45 (lire en ligne)