Grammar of Society: the Nature and Dynamics of Social Norms, Cambridge University Press, Cambridge. Dancy, Jonathan (ed) (2000), Normativity, Blackwell, Oxford. Garzón Valdés, Ernesto et al. (eds) (1997), Normative Systems in Legal and Moral Theory: Festschrift for Carlos E. Alchourrón and Eugenio Bulygin, Duncker & Humblot, Berlin. Korsgaard, Christine (2000), The Sources of Normativity, Cambridge University, Cambridge. Raz, Joseph (1975, 1990), Practical Reason and Norms, Oxford University Press, Oxford; 2nd edn 1990. Rosen, Bernard (1999), The Centrality of Normative Ethical Theory, Peter Lang, New York. Ruiter, Dick (1993), Institutional Legal Facts: Legal Powers and their Effects, Kluwer, Dordrecht. Turri, John (2016), Knowledge and the Norm of Assertion: An Essay in Philosophical Science, Open Book Publishers, Cambridge. von Wright, G. H. (1963), Norm and Action: a Logical Enquiry, Routledge & Kegan Paul, London. Concepts in ethics Consensus reality Philosophy of language Philosophy of law Social concepts