Cita APA (7a ed.)

Engelmann, P., & Wittgenstein, L. (1967). Letters from Ludwig Wittgenstein: With a memoir. Basil Blackwell.

Cita Chicago Style (17a ed.)

Engelmann, Paul, y Ludwig Wittgenstein. Letters from Ludwig Wittgenstein: With a Memoir. Oxford: Basil Blackwell, 1967.

Cita MLA (9a ed.)

Engelmann, Paul, y Ludwig Wittgenstein. Letters from Ludwig Wittgenstein: With a Memoir. Basil Blackwell, 1967.