Robinson, Glen O., author
West Publishing, 1986
Buku Teks
Robinson, Glen O., author
West Publishing, 1974
Buku Teks
Kettl, Donald F., author
Brookings Institution Press, 2000
Buku Teks
Ford Foundation , 1978
Buku Teks
Copley, Paul A., author
McGraw Hil, 2015
Buku Teks