See §116 in Ludwig Wittgenstein (2009). Peter Hacker; Joachim Schulte (eds.). Philosophical Investigations (Translation by Gertrude Elizabeth Margaret Anscombe, 4th ed.). John Wiley & Sons. ISBN978-1405159289. Posthumously published in 1953. Part 1: Philosophical Investigations; Part 2: Philosophy of Psychology - A fragment.
Bauer, Nancy; Beckwith, Sarah; Crary, Alice; Laugier, Sandra; Moi, Toril; Zerilli, Linda (Spring 2015). "Introduction"(PDF). New Literary History. 46 (2). Johns Hopkins University Press: v–xiii. doi:10.1353/nlh.2015.0012. Archived from the original(PDF) on 6 September 2015.
Bauer, Nancy; Beckwith, Sarah; Crary, Alice; Laugier, Sandra; Moi, Toril; Zerilli, Linda (Spring 2015). "Introduction"(PDF). New Literary History. 46 (2). Johns Hopkins University Press: v–xiii. doi:10.1353/nlh.2015.0012. Archived from the original(PDF) on 6 September 2015.
Bauer, Nancy; Beckwith, Sarah; Crary, Alice; Laugier, Sandra; Moi, Toril; Zerilli, Linda (Spring 2015). "Introduction"(PDF). New Literary History. 46 (2). Johns Hopkins University Press: v–xiii. doi:10.1353/nlh.2015.0012. Archived from the original(PDF) on 6 September 2015.