APA (7th ed.) Citation

Wittgenstein, L., Reguera, I., & Wittgenstein, L. (2009). Wittgenstein. Gredos.

Chicago Style (17th ed.) Citation

Wittgenstein, Ludwig, Isidoro Reguera, and Ludwig Wittgenstein. Wittgenstein. Madrid: Gredos, 2009.

MLA (9th ed.) Citation

Wittgenstein, Ludwig, et al. Wittgenstein. Gredos, 2009.