@Misc{BVMC:273998, author = {Cueva, Beltrán de la, Duque de Alburquerque}, title = {[Carta del Duque de Alburquerque al Rey, 20-06-1621].}, url = {https://www.cervantesvirtual.com/obra/carta-del-duque-de-alburquerque-al-rey-20-06-1621} }