@misc{Versor_Johann_(_-około_1485)_Dicta,
 author={Versor, Johann ( -około 1485) and Jan XXI (papież ; ca 1220-1277)},
 howpublished={online},
 publisher={Henricus Quentell},
 language={lat},
 type={inkunabuł},
 title={Dicta super septem tractatus Summularum Petri Hispani, cum textu},
 title={Summulae logicales},
}