Carmina aurea, etc
MLA
Pseudo-Pythagoras. Carmina Aurea, Etc. 0AD. https://collections.library.yale.edu/catalog/32458357.
APA, 6th edition
P.-P. (0 C.E.). Carmina aurea, etc [Manuscripts, Medieval Byzantine Empire 15th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/32458357.