APA (7th ed.) Citation

Polybius, Scott-Kilvert, I., & Walbank, F. W. (1979). Polybius: The rise of the Roman Empire. Penguin.

Chicago Style (17th ed.) Citation

Polybius, Ian Scott-Kilvert, and F. W. Walbank. Polybius: The Rise of the Roman Empire. Harmondworth, England: Penguin, 1979.

MLA (9th ed.) Citation

Polybius, et al. Polybius: The Rise of the Roman Empire. Penguin, 1979.