APA Edition Citation

Wittgenstein, L., Anscombe, G. E. M., & Wright, G. H. v. (1969). On certainty. Blackwell.

Chicago Edition Citation

Wittgenstein, Ludwig, G. E. M. Anscombe, and G. H. von Wright. On Certainty. Oxford: Blackwell, 1969.

MLA Edition Citation

Wittgenstein, Ludwig, et al. On Certainty. Blackwell, 1969.