@misc{_Constitutiones,
 howpublished={online},
 publisher={Piotrkowczyk, Andrzej},
 language={lat},
 type={starodruki},
 title={Constitutiones Synodorum, Metropolitanae Ecclesiae Gnesnensis [...] usque ad annum [...] 1578 [rom.]},
 keywords={Gniezno 16w., synod 1578},
}