MLA

Serapion, Johannes, the Elder, 9th century. Breviarum medicinae. 1 August 1479.. https://collections.library.yale.edu/catalog/10893330.

APA, 6th edition

Serapion, Johannes, the Elder, 9th century. (1 August 1479.)[Breviarum medicinae]. https://collections.library.yale.edu/catalog/10893330.