Ribeiro R, Torres J, Carretero M A, Sillero N, Llorente G A (2010) Unsuspected richness near home. New herpetological records in Porto Metropolitan Area (NW Portugal). Boletín de la Asociación Herpetológica Española, 21: 27-30.

Ribeiro R, Torres J, Carretero M A, Sillero N, Liorente G A (2008) New observations of the Iberian Worm Lizard (Blanus cinereus) and the Bedriaga’s Skink (Chalcides bedriagai) bring reliability to the historical records from Porto region (NW Portugal). Boletín de la Asociación Herpetológica Española, 19: 49-50.