MLA

Scot, Michael, approximately 1175-approximately 1234. Liber physiognomiae. "M.CCCC.lxxxuij" (1484 or 1487).. https://collections.library.yale.edu/catalog/16986898.

APA, 6th edition

Scot, Michael, approximately 1175-approximately 1234. ("M.CCCC.lxxxuij" (1484 or 1487).)[Liber physiognomiae]. https://collections.library.yale.edu/catalog/16986898.