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, no 2, , 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, no 2, , 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, no 2, , 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, no 4, , p. 37–45 (lire en ligne)