APA-Zitierstil (7. Ausg.)

O'Brien, D. (2017). An introduction to the theory of knowledge (Second edition.). Polity.

Chicago-Zitierstil (17. Ausg.)

O'Brien, Dan. An Introduction to the Theory of Knowledge. Second edition. Cambridge, UK, Malden, MA, USA: Polity, 2017.

MLA-Zitierstil (9. Ausg.)

O'Brien, Dan. An Introduction to the Theory of Knowledge. Second edition. Polity, 2017.