Osborne Catherine. Presocratic Philosophy: A Very Short Introduction. Oxford.
Cita Chicago (17th ed.)Osborne Catherine. Presocratic Philosophy: A Very Short Introduction. New York New York: Oxford.
Cita MLA (9th ed.)Osborne Catherine. Presocratic Philosophy: A Very Short Introduction. Oxford.
Atenció: Aquestes cites poden no estar 100% correctes.