Patterson, R. N., & Kalember, P. (2003). Balance of power. New York: Random House.
Dyfyniad Arddull ChicagoPatterson, Richard North., và Patricia Kalember. Balance of Power. New York: Random House, 2003.
Dyfyniad MLAPatterson, Richard North., và Patricia Kalember. Balance of Power. New York: Random House, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.