Rerum vulgarium fragmenta, etc
MLA
Petrarca, Francesco, 1304-1374. Rerum vulgarium fragmenta, etc. s. XV 1/4 [1st quarter 15th century]. https://collections.library.yale.edu/catalog/2005489.
APA, 6th edition
Petrarca, Francesco, 1304-1374. (s. XV 1/4 [1st quarter 15th century])[Rerum vulgarium fragmenta, etc]. https://collections.library.yale.edu/catalog/2005489.