Cita APA (7th ed.)
Wittgenstein, L. Preliminary Studies for the Philosophical Investigations: Generally Known as the Blue and Brown Books. Basil Blackwell.
Cita Chicago (17th ed.)
Wittgenstein, Ludwig. Preliminary Studies for the Philosophical Investigations: Generally Known as the Blue and Brown Books. Oxford, Inglaterra: Basil Blackwell.
Cita MLA (9th ed.)
Wittgenstein, Ludwig. Preliminary Studies for the Philosophical Investigations: Generally Known as the Blue and Brown Books. Basil Blackwell.
Atenció: Aquestes cites poden no estar 100% correctes.