“Four-lined Snake”. 《Red Data Book of the Republic of Bulgaria》. 2015. 2015년 12월 8일에 확인함.
doi.org
dx.doi.org
Jelka Crnobrnja Isailovic; Rastko Ajtic; Milan Vogrin; Claudia Corti; Valentin Pérez Mellado; Paulo Sá-Sousa; Marc Cheylan; Juan M. Pleguezuelos; Petros Lymberakis; Roberto Sindaco; Antonio Romano; Dušan Jelić (2009). “Elaphe quatuorlineata”. IUCN Red List of Threatened Species2009: e.T157264A5065135. doi:10.2305/IUCN.UK.2009.RLTS.T157264A5065135.en.
Ernesto Filippi; Rugiero, L.; Capula, M.; Capizzi, D. & Luiselli, L. (2005). “Comparative food habits and body size of five populations of Elaphe quatuorlineata: the effects of habitat variation, and the consequences of intersexual body size dimorphism on diet divergence”. 《Copeia》 2005 (3): 517–525. doi:10.1643/ch-04-350r1. JSTOR4098561.
jstor.org
Ernesto Filippi; Rugiero, L.; Capula, M.; Capizzi, D. & Luiselli, L. (2005). “Comparative food habits and body size of five populations of Elaphe quatuorlineata: the effects of habitat variation, and the consequences of intersexual body size dimorphism on diet divergence”. 《Copeia》 2005 (3): 517–525. doi:10.1643/ch-04-350r1. JSTOR4098561.
