MLA

Evrard de Béthune. Graecismus. 1426. https://collections.library.yale.edu/catalog/11403192.

APA, 6th edition

Evrard de Béthune. (1426). Graecismus [Manuscripts, Medieval Italy 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11403192.