@misc{Sykstus_IV_(papież_;_1414-1484)_Bulla,
 author={Sykstus IV (papież ; 1414-1484)},
 howpublished={online},
 publisher={[Typographus Sixti IV Bullae]},
 language={lat},
 type={inkunabuł},
 title={Bulla de reformatione Confraternitatis Hospitalis s. Spiritus},
}