APA (7th ed.) Citation

Porfirio, c. 2. 3., & Barnes, J. (2003). Porphyry Introduction. Clarendon Press ; Oxford University Press.

Chicago Style (17th ed.) Citation

Porfirio, ca. 234-ca. 305, and Jonathan Barnes. Porphyry Introduction. Oxford : New York: Clarendon Press ; Oxford University Press, 2003.

MLA (9th ed.) Citation

Porfirio, ca. 234-ca. 305, and Jonathan Barnes. Porphyry Introduction. Clarendon Press ; Oxford University Press, 2003.