@misc{Porphyrius_(c._234_–_c._303)_Isagoge,
 author={Porphyrius (c. 234 – c. 303)},
 howpublished={online},
 publisher={[Martinus Landsberg]},
 language={lat},
 type={inkunabuł},
 title={Isagoge in Aristotelis Praedicamenta},
}