References
Books
Evans, P.G.H., 1987. The Natural History of Whales and Dolphins, Facts On File Publications, P. 1-31
Lockley, R.M., 1979. Whales, Dolphins and Porpoises. David & Charles Ltd., P. 59
Martin, R.M., 1977. Mammals of the Sea, B.T. Bastsford Ltd., P. 44-51
National Geographic Society, 1979. Wild Animals of North America. P. 167-174
Slijper, E.J., 1976. Whales and Dolphins. University of Michigan. P. 17
Zahn, K., 1988. Whales. Michael Friedman Publishing Group, Inc. P. 26-29, 35, 66-69, 72, 100, 104, 108
Journals
Adachi, J. & Hasegawa, M., 1996. Molecular Biology and Evolution: Phylogenetic Position of Cetaceans Relative to Artiodactyls: Reanalysis of Mictochandrial and Nuclear Sequences. Vol. 13, No. 5 P. 710-717
Monastersky, R., Jan., 1994. Science News: Fossil Whale Feet: A Step in Evolution. Vol. 145, P. 36
Monastersky, R., June, 1996. Science News: Ancient Whales: Thirsty at Sea. Vol. 149, P. 399
Ridgway, S., 1972. Mammals of the Sea. Biology and Medicine. Charles C. Thomas, Conneticut.
Video
Dolphins with Robin Williams. A Tigress Production. 1994
Websites
http://www.seaworld.org/infobook.html
http://www.intersurf.com/~heinrich/Basilosaurus1.html