@Book{BVMC:787647, author = {Ugena, Enrique M.}, title = {Carta de Enrique M. Ugena a Rafael Altamira. México, 28 de mayo de 1910}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2017}, year = {2017}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmc3j5g8} }