APA (7th ed.) Citation

Millar, F., & Frye, R. N. (1993). The Roman Empire and its neighbours (2nd ed.). Duckworth.

Chicago Style (17th ed.) Citation

Millar, Fergus, and Richard Nelson Frye. The Roman Empire and Its Neighbours. 2nd ed. London: Duckworth, 1993.

MLA (9th ed.) Citation

Millar, Fergus, and Richard Nelson Frye. The Roman Empire and Its Neighbours. 2nd ed. Duckworth, 1993.