APA (7th ed.) Citation

Wittgenstein, L. (1964). Preliminary studies for the "Philosophical investigations" generally known as the blue and brown books. Blackwell.

Chicago Style (17th ed.) Citation

Wittgenstein, Ludwig. Preliminary Studies for the "Philosophical Investigations" Generally Known as the Blue and Brown Books. Oxford: Blackwell, 1964.

MLA (9th ed.) Citation

Wittgenstein, Ludwig. Preliminary Studies for the "Philosophical Investigations" Generally Known as the Blue and Brown Books. Blackwell, 1964.