@misc{Sommerfeld_Jan_(?-1501)_Modus,
 author={Sommerfeld, Jan (?-1501)},
 howpublished={online},
 publisher={Wietor, Hieronim},
 language={lat},
 type={starodruki},
 title={Modus epistolandi Joannis Aesticampiani Viginti genera epistolaru[m] co[m]plectens [...]},
 keywords={sztuka pisania 16w., listy 16w., epistolografia 16w., poradniki 16w.},
}