@Misc{BVMC:260007, author = {Ponz, Juan}, title = {Concio super kalendam, quae legitur in vigilia sacrosancti Natalis Christi Domini}, url = {https://www.cervantesvirtual.com/obra/concio-super-kalendam-quae-legitur-in-vigilia-sacrosancti-natalis-christi-domini} }