@Book{BVMC:724720, author = {Labra, Rafael M. de}, title = {Carta de Rafael M. de Labra a Rafael Altamira. Madrid, 23 de mayo de 1909}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2015}, year = {2015}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcwd5t5} }