APA (7th ed.) Citation

Cicero, M. T., & Shackleton Bailey, D. R. (1982). Selected letters. Penguin Books.

Chicago Style (17th ed.) Citation

Cicero, Marcus Tullius, and D. R. Shackleton Bailey. Selected Letters. New York, N.Y.: Penguin Books, 1982.

MLA (9th ed.) Citation

Cicero, Marcus Tullius, and D. R. Shackleton Bailey. Selected Letters. Penguin Books, 1982.