APA (7th ed.) Citation

Porfirio, c. 2. 3., & Raffa, M. (2016). Comentarius in Claudii Ptolemaei harmonica. Walter De Gruyter.

Chicago Style (17th ed.) Citation

Porfirio, ca. 234-ca. 305, and Massimo Raffa. Comentarius in Claudii Ptolemaei Harmonica. Berlin ; Boston: Walter De Gruyter, 2016.

MLA (9th ed.) Citation

Porfirio, ca. 234-ca. 305, and Massimo Raffa. Comentarius in Claudii Ptolemaei Harmonica. Walter De Gruyter, 2016.