APA (7th ed.) Citation

Porphyry, a. 2. 3., Raffa, M., & Barker, A. (2016). Commentarius in Claudii Ptolemaei Harmonica. De Gruyter.

Chicago Style (17th ed.) Citation

Porphyry, approximately 234-approximately 305, Massimo Raffa, and Andrew Barker. Commentarius in Claudii Ptolemaei Harmonica. Berlin ; Boston: De Gruyter, 2016.

MLA (8th ed.) Citation

Porphyry, approximately 234-approximately 305, et al. Commentarius in Claudii Ptolemaei Harmonica. De Gruyter, 2016.