M.S.Y. Lee m.fl. (2007). «Phylogeny of snakes (Serpentes): combining morphological and molecular data in likelihood Bayesian and parsimony analyses». Systematics and Biodiversity. 5 (4): 371–389. ISSN1477-2000. doi:10.1017/S1477200007002290.
N. Vidal og S.B. Hedges (2009). «The molecular evolutionary tree of lizards, snakes, and amphisbaenians». C. R. Biologies. 332 (2–3): 129–139. ISSN1631-0691. doi:10.1016/j.crvi.2008.07.010.
M.S.Y. Lee m.fl. (2007). «Phylogeny of snakes (Serpentes): combining morphological and molecular data in likelihood Bayesian and parsimony analyses». Systematics and Biodiversity. 5 (4): 371–389. ISSN1477-2000. doi:10.1017/S1477200007002290.
N. Vidal og S.B. Hedges (2009). «The molecular evolutionary tree of lizards, snakes, and amphisbaenians». C. R. Biologies. 332 (2–3): 129–139. ISSN1631-0691. doi:10.1016/j.crvi.2008.07.010.