@Misc{BVMC:267224, author = {Cappelletti, Enrique M.}, title = {Apuntes de Astronomia elemental o Cosmografia...}, publisher = {Alicante : Biblioteca Virtual Miguel de Cervantes, 2010}, year = {2010}, url = {https://www.cervantesvirtual.com/nd/ark:/59851/bmcth8p7} }