APA (7th ed.) Citation

Polybius & Bernstein, A. H. (1980). Polybius on Roman imperialism: The histories of Polybius. Regnery/Gateway.

Chicago Style (17th ed.) Citation

Polybius and Alvin H. Bernstein. Polybius on Roman Imperialism: The Histories of Polybius. South Bend, Ind.: Regnery/Gateway, 1980.

MLA (9th ed.) Citation

Polybius and Alvin H. Bernstein. Polybius on Roman Imperialism: The Histories of Polybius. Regnery/Gateway, 1980.