@Misc{BVMC:239543, author = {Porras Gil, María Concepción}, title = {Carlos V y la fortificación de las fronteras peninsulares}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2001}, year = {2001}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcmg7k9} }