MLA

Macer, Floridus. Viribus Herbarum (Fragment). 0AD. https://collections.library.yale.edu/catalog/10621961.

APA, 6th edition

Macer, F. (0 C.E.). Viribus herbarum (fragment). [Early works to 1800, Manuscripts, Medieval Germany 14th century, Medieval and Renaissance Manuscript Fragments in Beinecke Library, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10621961.