@Book{BVMC:927870, author = {Sierra, Justo}, title = {Carta de Justo Sierra a Rafael Altamira. México, 6 de julio de 1910}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2018}, year = {2018}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc0927870} }