@Book{BVMC:1134242, author = {Fernando IV, Rey de Castilla}, author = {Alfonso X, Rey de Castilla}, author = {Sancho IV, Rey de Castilla}, title = {Crónicas de Alfonso X, Sancho IV y Fernando IV }, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2021}, year = {2021}, url = {https://www.cervantesvirtual.com/obra/cronicas-de-alfonso-x-sancho-iv-y-fernando-iv--1134242} }