@Misc{BVMC:278891, author = {Echeverría, Esteban}, title = {Carta de Esteban Echeverría a Félix Frías (8-4-1850)}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2010}, year = {2010}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcvd7f2} }