MLA

Vegetius Renatus, Flavius. Epitome Rei Militaris. 0AD. https://collections.library.yale.edu/catalog/11403228.

APA, 6th edition

Vegetius Renatus, F. (0 C.E.). Epitome rei militaris [Early works to 1800, Manuscripts, Medieval France 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/11403228.