Gordon, Malcom. & Olson, Everett. 1995. Invasions
of the land. Columbia University Press.
New York, New York.
Graham, Jeffrey. 1997. Air-Breathing Fishes: Evolution,
Diversity, and Adaptation. Academic
Press. San Diego.
Schmalhausen, Ivan Ivanovich. 1968. The Origin of Terrestrial
Vertebrates. Academic Press.
New York, New York.
Lemon, Roy R. 1993. Vanished Worlds: An Introduction
to Historical Geology. Wm. C. Brown
Publishers. Dubuque, Iowa.
Internet:
http://www.gla.ac.uk/Acad/IBLS/DEEB/biomedia/units/fish8.htm
http://pc65.frontier.osrhe.edu/hs/science/zoagath.htm
http://www.nettl.usyd.edu.au/bio2animals/sem2pgs/sem2wk8.htm
Source for anatomical comparison pictures
All "Corbis.com" picture obtained from the Yahoo
Image Gallery