1. HANS KELSEN, THE GENERAL THEORY OF LAW AND STATE, (Anders Wedberg trans., 1945)
2. ANTHONY W. BRADLEY & KEITH D. EWING, CONSTITUTIONAL AND ADMINISTRATIVE LAW(14TH ED. 2007)
3. The Autonomy of the Community Legal Order: An Analysis of Possible Foundations;Theodor Schilling;HARV. INT. L.J.,1996
4. CARL SCHMITT, CONSTITUTIONAL THEORY, (Jeffrey Seitzer, Trans., 2008)
5. CONSTITUTIONALISM: PHILOSOPHICAL FOUNDATIONS (Larry Alexander ed., 1998)