MLA

de Pontremulo, Conradinus. Regule Grammaticles. 0AD. https://collections.library.yale.edu/catalog/10621948.

APA, 6th edition

de Pontremulo, C. (0 C.E.). Regule grammaticles [Early works to 1800, Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10621948.