APA (7th ed.) Citation

Monk, R. (1991). Ludwig Wittgenstein : the duty of genius / Ray Monk: The duty of genius. Vintage.

Chicago Style (17th ed.) Citation

Monk, Ray. Ludwig Wittgenstein : The Duty of Genius / Ray Monk: The Duty of Genius. London: Vintage, 1991.

MLA (9th ed.) Citation

Monk, Ray. Ludwig Wittgenstein : The Duty of Genius / Ray Monk: The Duty of Genius. Vintage, 1991.

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