@misc{Sommerfeld_Jan_(14..-1501_;_starszy)_Modus, author={Sommerfeld, Jan (14..-1501 ; starszy)}, address={Kraków}, howpublished={online}, publisher={Haller, Jan (ca 1467-1525). Druk.}, language={lat}, title={Modus epistolandi magistri Ioannis Esticampiani al[ia]s Sumerfelt, viginti genera epistolarum co[m]plectens}, type={stary druk}, }