1. Alchourrón, C. (1995). Defeasible logic: Demarcation and affinities In G. Crocco, L. Fariñas del Cerro, A. Herzig (Eds.), , Conditionals: From philosophy to computer science (pp. 67–102). Oxford: Oxford University Press.
2. Åqvist, L. (1987). An introduction to deontic logic and the theory of normative systems. Naples: Bibliopolis.
3. Åqvist, L. (2002). Deontic logic. In D. Gabbay & F. Guenthner (Eds.), Handbook of philosophical logic (Vol 8, pp. 147–264), 2nd edn. Dordrecht, Holland: Kluwer Academic Publishers.
4. Arló Costa, H. (2006). Rationality and value: The epistemological role of indeterminate and agent-dependent values. Philosophical Studies, 128(1), 7–48.
5. Bossert, W., & Suzumura, K. (2010). Consistency, choice, and rationality. Cambridge: Harvard University Press.