Barnes 2003, ப. xv clarifies that the Isagoge "[was] not an Introduction to the Categories, rather "[since it was] an introduction to the study of logic, [it] was... an introduction to philosophy--and hence accidentally an introduction to the Categories." Barnes, Jonathan (2003). Porphyry: Introduction. Oxford: Clarendon. பன்னாட்டுத் தரப்புத்தக எண்978-0-19-924614-4.