APA (7th ed.) Citation

Horace & Page, T. E. (1916). Carminum, liber I. Macmillan.

Chicago Style (17th ed.) Citation

Horace and T. E. Page. Carminum, Liber I. London: Macmillan, 1916.

MLA (9th ed.) Citation

Horace and T. E. Page. Carminum, Liber I. Macmillan, 1916.