 A second question is: What are the sources of these contributors to the content of the law? In virtue of what do texts or enactments or interpretations or moral considerations figure into grounding the content of a nation’s laws? Positivist theories hold that social practices and other sociological facts are the sources of legality; natural law theories argue instead that legality is rooted in human nature and that legal standards are independent of human decision and practice. A central problem for any theory of the sources of law is the authority, or bindingness, which law carries (if it does carry these). See the articles in J.L. Coleman, Shapiro, &amp; Himma 2002, as well as entries on the  nature of law,  natural law theories,  legal positivism,  and  the economic analysis of law.