APA (7th ed.) Citation

Porphyrius 233-301 & Pötscher, W. (1969). Pros Markellan. Philosophia antiqua.

Chicago Style (17th ed.) Citation

Porphyrius 233-301 and Walter Pötscher. "Pros Markellan." Philosophia Antiqua 1969.

MLA (8th ed.) Citation

Porphyrius 233-301 and Walter Pötscher. "Pros Markellan." Philosophia Antiqua, 1969.

Warning: These citations may not always be 100% accurate.