1889
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1904
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1908
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Ruthven, Alexander G. Variations and genetic relationships of the garter-snakes. Bulletin of the United States National Museum (61):1-201
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1932
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1980
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1994
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2002
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de Queiroz, Alan, Robin Lawson, and Julio A. Lemos-Espinal. Phylogenetic relationships of North American garter snakes (Thamnophis) based on four mitochondrial genes: How much DNA sequence is enough?. Molecular Phylogenetics and Evolution 22(2):315-329
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