@Book{BVMC:292598, author = {Unamuno, Miguel de}, title = {Carta de Miguel de Unamuno a Rafael Altamira. Salamanca, 26 de marzo de 1896}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2012}, year = {2012}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcht394} }