@Book{BVMC:292751, author = {Calzada, César}, title = {Carta de César Calzada a Rafael Altamira. Buenos Aires, 6 de agosto de 1909}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2012}, year = {2012}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc4t769} }