Fisher,Louis. (1972). President and congress: Powers and policy. Free press.
Dyfyniad Arddull ChicagoFisher,Louis. President and Congress: Powers and Policy. New York: Free press, 1972.
Dyfyniad MLAFisher,Louis. President and Congress: Powers and Policy. Free press, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.