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In biology, a division is the equivalent of a phylum in a kingdom. Botanists use the word "division" where zoologists use the word "phylum". In biology, a phylum is a taxonomic rank below kingdom and above class.
- Carroll, Robert L. 1988. Vertebrate Paleontology and Evolution. New York: W.H. Freeman & Co. ISBN 0-716-7-1822-7.
- Milner, Andrew. 1988. "The relationships and origin of living amphibians." In M.J. Benton (ed.), The Phylogeny and Classification of the Tetrapods, Volume 1: Amphibians, Reptiles, Birds, pp. 59–102. Oxford: Clarendon Press.
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