APA (7th ed.) Citation

WITTGENSTEIN, L. (1969). The Blue and brown books: Preliminary studies for the 'philosophical Investigations (2nd ed.). Blackwell.

Chicago Style (17th ed.) Citation

WITTGENSTEIN, Ludwig. The Blue and Brown Books: Preliminary Studies for the 'Philosophical Investigations. 2nd ed. Oxford: Blackwell, 1969.

MLA (9th ed.) Citation

WITTGENSTEIN, Ludwig. The Blue and Brown Books: Preliminary Studies for the 'Philosophical Investigations. 2nd ed. Blackwell, 1969.