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 Four-lined Snake Elaphe quatuorlineata . Från: IUCN 2009. IUCN Red List of Threatened Species. Version 2018.1. Läst 17 juli 2022.