Sillero, N., Campos, J., Bonardi, A., Corti, C., Creemers, R., Crochet, P., Crnobrnja Isailović, J., Denoël, M., Ficetola, G. F., Gonçalves, J., Kuzmin, S., Lymberakis, P., de Pous, P., Rodríguez, A., Sindaco, R., Speybroeck, J., Toxopeus, B., Vieites, D. R., Vences, M. (2014) Updated distribution and biogeography of amphibians and reptiles of Europe. Amphibia – Reptilia, 35, 1-31.
It’s very interesting! If you need help, look here: hitman agency