@Book{BVMC:678590, author = {Calderón de la Barca, Pedro}, title = {El príncipe constante = Ksiaze Niezlomny (z Calderona de la Barca)}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2014}, year = {2014}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcn8944} }