APA (7th ed.) Citation

Marcus Aurelius, Hammond, M., & Clay, D. (2006). Meditations. Penguin Books.

Chicago Style (17th ed.) Citation

Marcus Aurelius, Martin Hammond, and Diskin Clay. Meditations. London: Penguin Books, 2006.

MLA (9th ed.) Citation

Marcus Aurelius, et al. Meditations. Penguin Books, 2006.