@Book{BVMC:789095, author = {Unamuno, Miguel de}, title = {Carta de Miguel de Unamuno a Manuel Ugarte. 27 de octubre de 1902}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2017}, year = {2017}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcfj4j5} }