APA (7th ed.) Citation

Wittgenstein, L. (1972). On certainty. Harper & Row Publishers.

Chicago Style (17th ed.) Citation

Wittgenstein, Ludwig. On Certainty. New York-Evanston-San Francisco-London: Harper & Row Publishers, 1972.

MLA (9th ed.) Citation

Wittgenstein, Ludwig. On Certainty. Harper & Row Publishers, 1972.