Kalp, E. S., & Morgan, R. M. (1941). Defense of the western hemisphere. Ginn and Company.
Dyfyniad Arddull ChicagoKalp, Earl S., and Robert M. Morgan. Defense of the Western Hemisphere. Boston, New York [etc.]: Ginn and Company, 1941.
Dyfyniad MLAKalp, Earl S., and Robert M. Morgan. Defense of the Western Hemisphere. Ginn and Company, 1941.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.