MLA

John of Wales, fl. 1260. Summa Ioannis Valensis de regimine uite humane, seu, Margarita docto[rum] ad omne p[ro]positum : p[ro]ut patet in tabula.. anno Domini MCCCCXCVI die penultima Iulij [30 July 1496]. https://collections.library.yale.edu/catalog/16189393.

APA, 6th edition

John of Wales, fl. 1260. (anno Domini MCCCCXCVI die penultima Iulij [30 July 1496])[Summa Ioannis Valensis de regimine uite humane, seu, Margarita docto[rum] ad omne p[ro]positum : p[ro]ut patet in tabula.]. https://collections.library.yale.edu/catalog/16189393.