Perloff, Marjorie: In Search of the Redeeming Word: Wittgenstein’s Private Notebooks 1914–16 and the Making of the Tractatus, in: Stadler, Friedrich (ed.): Wittgenstein and the Vienna Circle: 100 Years After the Tractatus Logico-Philosophicus (Vienna Circle Institute Yearbook), Cham 2023 Springer International Publishing, pp. 35-51.