APA (7th ed.) Citation

Monk, R. (1991). Ludwig Wittgenstein: The duty of genius. Penguin Books.

Chicago Style (17th ed.) Citation

Monk, Ray. Ludwig Wittgenstein: The Duty of Genius. New York: Penguin Books, 1991.

MLA (9th ed.) Citation

Monk, Ray. Ludwig Wittgenstein: The Duty of Genius. Penguin Books, 1991.

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