MLA

Porphyry, approximately 234-approximately 305. Isagoge, etc. [between 1200 and 1300]. https://collections.library.yale.edu/catalog/17286954.

APA, 6th edition

Porphyry, approximately 234-approximately 305. ([between 1200 and 1300])[Isagoge, etc]. https://collections.library.yale.edu/catalog/17286954.