Cite

Rerum vulgarium fragmenta, etc

MLA

Petrarca, Francesco, 1304-1374. Rerum vulgarium fragmenta, etc. [between 1400 and 1425]. https://collections.library.yale.edu/catalog/2005489.

APA, 6th edition

Petrarca, Francesco, 1304-1374. ([between 1400 and 1425])[Rerum vulgarium fragmenta, etc]. https://collections.library.yale.edu/catalog/2005489.