Milan Vogrin, Claudia Corti, Valentin Pérez Mellado, Paulo Sá-Sousa, Marc Cheylan, Juan M. Pleguezuelos, Andreas Meyer, Benedikt Schmidt, Roberto Sindaco, Antonio Romano, Iñigo Martínez-Solano. Hierophis viridiflavus // IUCNRed List of Threatened Species. Version 2013.2. International Union for Conservation of Nature, 2008. Посетен на 28 септември 2014. (на английски)