Ancient Greek text
Ὄντος ἀναγκαίου, Χρυσαόριε, καὶ εἰς τὴν τῶν παρὰ Ἀριστοτέλει κατηγοριῶν …
Porphyrii isagoge et in Aristotelis categorias commentarium, Reimer, Berlin, 1887
Porphyrius, Isagoge sive quinque voces, ed. Adolf Busse. Text: The Greek Library, from the Perseus Digital Library and other open sources, CC BY-SA 4.0. Changes: apostrophes normalised and the text divided into reading sections by Interlinea.
Texts from The Greek Library and the Perseus Digital Library, under CC BY-SA 4.0 and CC BY 4.0. Divided into reading sections by Interlinea.