Cita APA (7a ed.)

Pears, D. (1973). Wittgenstein. Grijalbo.

Cita Chicago Style (17a ed.)

Pears, David. Wittgenstein. Barcelona [etc.]: Grijalbo, 1973.

Cita MLA (9a ed.)

Pears, David. Wittgenstein. Grijalbo, 1973.