LITERATURE CITED
- Whitehead , A. N. 1925 . Science and the Modern World 296 New York : Macmillan Co. .
- Wyss , A. R. and de Queiroz. , K. 1984 . Phylogenetic methods and the early history of amniotes. . Journal of Vertebrate Paleontology , 4 : 604 – 608 .