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Ahlberg, P. E.
http://www.nhm.ac.uk/palaeontology/v&a/pea/pea.html
Fossil fish and early tetrapod evolution (Natural History Museum [London]).
Clack, J.
http://www.zoo.cam.ac.uk/zoostaff/clack.htm
Early tetrapod evolution (Univ. Cambridge, Mus. of Zoology).
Laurin, M.
http://tolweb.org/tree/laurin/Laurin_Home_page.html
The origin and phylogeny of tetrapods (Université Paris).
Sues, H-D.
http://www.zoo.toronto.edu/zfa/Newsletter-htm/nov-99/sues.htm
Triassic and Early Jurassic tetrapod paleobiology, University of Toronto.