APA (7th ed.) Citation

Xenophon & Warner, R. (1966). History of my times (Hellenica). Penguin Books.

Chicago Style (17th ed.) Citation

Xenophon and Rex Warner. History of My Times (Hellenica). Harmondsworth, England ; Baltimore, Md.: Penguin Books, 1966.

MLA (9th ed.) Citation

Xenophon and Rex Warner. History of My Times (Hellenica). Penguin Books, 1966.