@misc{Ulricus_Ulmer_Fraternitas,
 author={Ulricus Ulmer},
 address={[Ulm]},
 howpublished={online},
 publisher={[Zainer, Johann (fl. 1472-1493). Druk.]},
 language={lat},
 title={Fraternitas cleri},
 keywords={15 w., Kolekcje Piastowskie, inkunabuły},
}