MLA

Thomas, Aquinas, Saint, 1225?-1274. Super metaphysicam, Super De causis. [between 1275 and 1300]. https://collections.library.yale.edu/catalog/10082020.

APA, 6th edition

Thomas, Aquinas, Saint, 1225?-1274. ([between 1275 and 1300])[Super metaphysicam, Super De causis]. https://collections.library.yale.edu/catalog/10082020.