@Book{BVMC:229429, author = {Beltrán y Rózpide, Ricardo}, title = {Ensayo sobre la América precolombina}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2006}, year = {2006}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcbv7v1} }