Boulding, K. E. (1964). The meaning of the twentieth century: The great transition. New York: Harper & Row publishers.
Dyfyniad Arddull ChicagoBoulding, Kenneth E. The Meaning of the Twentieth Century: The Great Transition. New York: Harper & Row publishers, 1964.
Dyfyniad MLABoulding, Kenneth E. The Meaning of the Twentieth Century: The Great Transition. New York: Harper & Row publishers, 1964.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.