Italian Paintings of the Thirteenth and Fourteenth Centuries: Saint Matthew, c. 1315/1320 | National Gallery of Art https://www.nga.gov/research/publications/italian-paintings-thirteenth-and-fourteenth-centuries-0/italian-paintings-thirteenth-and-fourteenth-centuries-saint-matthew-c-13151320
, that the version painted for the polyptych of Pisa around 1319–1320 was the model
