@Book{BVMC:620178, author = {Valerius, Cornelius}, title = {Cornelij Velerij Ultraiectini Grammaticarum institutionum liber [primus-quatuor]}, url = {https://www.cervantesvirtual.com/obra/cornelij-velerij-ultraiectini-grammaticarum-institutionum-liber-primus-quatuor} }