O'Brien, D. M. (2003). Constitutional law and politics (5th ed.). New York: Norton.
Dyfyniad Arddull ChicagoO'Brien, David M. Constitutional Law and Politics. 5th ed. New York: Norton, 2003.
Dyfyniad MLAO'Brien, David M. Constitutional Law and Politics. 5th ed. New York: Norton, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.