@Book{BVMC:292001, author = {Ollero, Alfonso E.}, title = {A S.M. el Rey D. Alfonso 12. Fábula El cisne y la Ondina}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2012}, year = {2012}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcgh9s9} }