13,2=1982; 14,3=1983; 17,3=1986; 18,3=1987; 19,3=1988/89; 20,3=1989/90 von: Annual review of American federalism
9,1=2; 10,1=3; 11,3/4=4; 15,3=1984; 16,3=1985; 21,3=1990/91; 22,3=1991/92; 23,3=1992/93; 24,3=1993/94; 25,3=1994/95; 26,3=1995/96; 27,2=1996/97; 28,1=1997/98; 29,2=1998/99; 30,1/2=1999/2000; 31,3=2000/01; 32,4=2001/02; 33,3=2002/03; 36,3=2005/06; 39,3=2008/09; 41,3=2010/11; 44,3=2013/14 von: The state of American federalism