Cannon, J. (1987). The great powers (2nd ed.). Longman.
Dyfyniad Arddull ChicagoCannon, Jim. The Great Powers. 2nd ed. London: Longman, 1987.
Dyfyniad MLACannon, Jim. The Great Powers. 2nd ed. Longman, 1987.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.