Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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