APA (7th ed.) Citation

O'brien, D. (1969). Empedocles' cosmic cycle. University Press.

Chicago Style (17th ed.) Citation

O'brien, D. Empedocles' Cosmic Cycle. Cambridge: University Press, 1969.

MLA (9th ed.) Citation

O'brien, D. Empedocles' Cosmic Cycle. University Press, 1969.

Warning: These citations may not always be 100% accurate.