TAYLOR, Thomas N. et al. Paleobotany. The biology and evolution of fossil plants. [s.l.]: Academic Press, 2009. Dostupné online. ISBN978-0-12-373972-8.
The IUCN red list of threatened species [online]. International Union for Conservation of Nature and Natural Resources, rev. 2013 [cit. 2014-05-01]. Dostupné online. (anglicky)