|Text Source:|| COSEWIC. 2007. COSEWIC assessment and update status report on the Gray Ratsnake Elaphe spiloides (Great Lakes/St. Lawrence population and Carolinian population) in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa. vii + 33 pp.
MacCulloch, R.D. 2002. The ROM Field Guide to the Amphibians and Reptiles of Ontario. Royal Ontario Museum and McClelland Stewart, Toronto. Pp. 168.
Prior, K.A. and P.J. Weatherhead. 1996. Status of the Black Rat Snake, Elaphe obsoleta obsoleta, in Canada. COSEWIC. pp. 34.
|Ontario Map Source:||See COSEWIC and MacCulloch in text source.|
|North American Map Source:||See COSEWIC and MacCulloch in text source.|
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