@Book{BVMC:947464, author = {Labra, Rafael M. de}, title = {Carta de Rafael M. de Labra a Rafael Altamira. Madrid, 15 de noviembre de 1909}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2019}, year = {2019}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc0947464} }