Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de [PDF; 200kB]).
Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de [PDF; 200kB]).
Z. T. Nagy, R. Lawson, U. Joger, M. Wink: Molecular systematics of racers, whipsnakes and relatives (Reptilia: Colubridae) using mitochondrial and nuclear markers. In: Journal of Zoological Systematics and Evolutionary Research. Band42, Nr.3. Blackwell Verlag, 2004, ISSN0947-5745, S.223–233, doi:10.1111/j.1439-0469.2004.00249.x (uni-heidelberg.de [PDF; 200kB]).