SCHMIDT, Alfred. Newly Discovered Wittgenstein Autograph in the Austrian National Library. Nordic Wittgenstein Review, [S. l.], v. 1, n. 1, 2012. Disponível em: https://www.nordicwittgensteinreview.com/article/view/NWR-1_2012-Schmidt. Acesso em: 22 feb. 2025.