Reference(s):
Carroll, R. L., 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698
Carroll, R. L., 1988: Appendix. 594-648.
in Carroll, R. L. 1988: Vertebrate paleontology and evolution.
–W. H. Freeman and company, New York, 1988, 698.
Lahti, S., Malmström, K. K., Koli, L., Leikola, A., Syrjämäki, J.
& Lahti, J., 1980:
Zoo, Suuri Eläinkirja 5: Kalat, sammakkoeläimet, matelijat.
--Werner Söderström Osakeyhtiö, Porvoo-Helsinki-Juva, 1980.
Original publication [in French]: Beauté Du Monde Animal:
IX Reptiles/Amphibiens & X Poissons
Rizzoli Editore, Milano 1968.
Uetz, P., Etzold, T. & Chenna, R.,
1995-2000: Family Colubridae (Colubrids).
–iNet: The TIGR Reptile Database
[former EMBL Reptile Database]: http://www.embl-heidelberg.de/~uetz/families/Colubridae.html