Citazione Stile APA (7a Edizione)

Black, M. (1964). A companion to Wittgenstein's tractatus. Cambridge University.

Citazione stile Chigago Style (17a edizione)

Black, Max. A Companion to Wittgenstein's Tractatus. Londres: Cambridge University, 1964.

Citatione MLA (9a ed.)

Black, Max. A Companion to Wittgenstein's Tractatus. Cambridge University, 1964.