MLA

Boccaccio, Giovanni, 1313-1375. Decamerone. [between 1300 and 1400]. https://collections.library.yale.edu/catalog/2013642.

APA, 6th edition

Boccaccio, Giovanni, 1313-1375. ([between 1300 and 1400])[Decamerone]. https://collections.library.yale.edu/catalog/2013642.