Friedrich Nietzsche: "Jenseits von Gut und B?se" (Frankfurt/M.: Insel Verlag, 1984, eller andre utgaver) (eng. overs. "Beyond Good and Evil"), kapitlene 1-7;
S?ren Kierkegaard, "Sygdommen til d?den", i Samlede v?rker, bind 15 (K?benhavn: Gyldendal, 1964);
Herbert Schn?delbach, "Philosophie in Deutschland 1831-1933 (Frankfurt/M.: Suhrkamp, 1983) (eng. overs. "Philosophy in Germany 1831-1933, Cambridge University Press, 1984), kapitlene 2-4;
Richard J. Bernstein, "Praxis and Action" (The University of California Press, 1971), part three: Action, conduct, and inquiry (Peirce and Dewey);
Alastair Hannay, Kierkegaard (London: Routledge, 1991), kapitlene 8, 9.