@Misc{BVMC:230482, author = {Beltrán y Rózpide, Ricardo}, title = {Geografía histórico-militar de España y Portugal}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2006}, year = {2006}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc6t110} }