APA (7th ed.) Citation

Cunliffe, B. W. (2003). The extraordinary voyage of Pytheas the Greek. Penguin Books.

Chicago Style (17th ed.) Citation

Cunliffe, Barry W. The Extraordinary Voyage of Pytheas the Greek. New York, N.Y.: Penguin Books, 2003.

MLA (8th ed.) Citation

Cunliffe, Barry W. The Extraordinary Voyage of Pytheas the Greek. Penguin Books, 2003.