@misc{Porphyrius_(ca_234-ca_303)_Isagoge,
 author={Porphyrius (ca 234-ca 303)},
 howpublished={online},
 publisher={Martin Landsberg},
 language={lat},
 type={inkunabuł},
 title={Isagoge in Aristotelis Praedicamenta},
 keywords={inkunabuły 15 w.},
}