@Book{BVMC:243187, author = {Vega, Lope de}, title = {La firmeza en la desdicha : comedia famosa}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes ; Madrid : Biblioteca Nacional, 2007}, year = {2007}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmczs2s3} }