MLA

Gesta Silvestri Papae; Liber Quare, Etc. 0AD. https://collections.library.yale.edu/catalog/10617193.

APA, 6th edition

Gesta Silvestri papae; Liber Quare, etc. (0 C.E.). [Manuscripts, Medieval Germany 13th century, Medieval and Renaissance Manuscripts in Beinecke Library]. https://collections.library.yale.edu/catalog/10617193.