APA (7th ed.) Citation

Cicero, M. T. 1., Griffith, M. T., & Atkins, E. M. (1990). On duties. Cambirdge University Press.

Chicago Style (17th ed.) Citation

Cicero, Marcus Tullius 106-43, M. T. Griffith, and E. M. Atkins. On Duties. Cambridge: Cambirdge University Press, 1990.

MLA (8th ed.) Citation

Cicero, Marcus Tullius 106-43, et al. On Duties. Cambirdge University Press, 1990.