@Book{BVMC:710191, author = {Labra, Rafael M. de}, title = {Carta de Rafael M. de Labra a Rafael Altamira. Madrid, 8 de marzo de 1907}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2015}, year = {2015}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcnc7v6} }