Article by Donald R. Prothero. Sample entry from the Encyclopedia of Paleontology, Fitzroy Dearborn Publishers. Cetacean Creation . New fossils leave researchers wondering where whales come from. Scientific American Article.
Fossil jaw tells tale of whale evolution .
Athens Daily News, October 1998. Primitive Eocene Whales . Paul V. Heinrich's Louisiana Fossil Pages. Ambulocetus as a Fossil Transitional . David Maddison and Wayne Maddison.