Arens, N. C. «
http://www.ucmp.berkeley.edu/people/nan/nan.html | | Paleobotany , university of california-berkeley. |
Burnham, R. J. «
http://www.geo.lsa.umich.edu/dept/faculty/burnham/index.html | | Evolutionary paleobotany , university of michigan. |
Marlow, M. G. «
http://www.sfu.ca/~mpellatt/marlow.htm | | Palynology , simon fraser university. |
Rothwell, G. W. «
http://oak.cats.ohiou.edu/~rothwell/ | | Fossil and living land plant phylogeny and evolution , ohio university. |
