MLA

John, of Wales, -approximately 1285. Communiloquium. [between 1300 and 1350?]. https://collections.library.yale.edu/catalog/32243376.

APA, 6th edition

John, of Wales, -approximately 1285. ([between 1300 and 1350?])[Communiloquium]. https://collections.library.yale.edu/catalog/32243376.