APA (7th ed.) Citation

Xenophon, Warner, R., & Cawkwell, G. (1979). A history of my times (Hellenica). Penguin Books.

Chicago Style (17th ed.) Citation

Xenophon, Rex Warner, and George Cawkwell. A History of My Times (Hellenica). London ; New York: Penguin Books, 1979.

MLA (9th ed.) Citation

Xenophon, et al. A History of My Times (Hellenica). Penguin Books, 1979.