@Book{BVMC:1066836, author = {Unamuno, Miguel de}, title = {Carta de Miguel de Unamuno a Manuel Azaña. Salamanca, 22 de mayo de 1918}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2021}, year = {2021}, url = {https://www.cervantesvirtual.com/obra/carta-de-unamuno-a-azana-22-de-mayo-de-1918-1066836} }