MLA

Regimen Sanitatis. Mathias Huss?, 0AD. https://collections.library.yale.edu/catalog/16986917.

APA, 6th edition

Regimen sanitatis. (0 C.E.). [Early works to 1800, Incunabula in Yale library]. Mathias Huss? https://collections.library.yale.edu/catalog/16986917.