APA (7th ed.) Citation

Wittgenstein, L. (1987). Preliminary studies for the Philosophical investigations, generally known as the Blue and Brown books (2nd ed.). Basil Blackwell.

Chicago Style (17th ed.) Citation

Wittgenstein, Ludwig. Preliminary Studies for the Philosophical Investigations, Generally Known as the Blue and Brown Books. 2nd ed. Oxford: Basil Blackwell, 1987.

MLA (9th ed.) Citation

Wittgenstein, Ludwig. Preliminary Studies for the Philosophical Investigations, Generally Known as the Blue and Brown Books. 2nd ed. Basil Blackwell, 1987.