Jose Antonio Mateo Miras, Marc Cheylan, M. Saïd Nouira, Ulrich Joger, Paulo Sá-Sousa, Valentin Pérez-Mellado, Iñigo Martínez-Solano, Roberto Sindaco, Antonio Romano. Chalcides chalcides // IUCNRed List of Threatened Species. Version 2013.2. International Union for Conservation of Nature, 2009. Посетен на 6 януари 2014. (на английски)