@Book{BVMC:709911, author = {Betanzos, Francisco}, author = {Vallarta, Ignacio L.}, title = {[Carta de Ignacio L. Vallarta y Francisco Betanzos a Francisco I. Madero. México (D.F.), 11 de mayo de 1911]}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2015}, year = {2015}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcf49j4} }