Booulding, K. E. (1964). The meaning of the Twentieth Century. Higginbothams.
Chicago Edition CitationBooulding, Kenneth E. The Meaning of the Twentieth Century. Madras: Higginbothams, 1964.
MLA引文Booulding, Kenneth E. The Meaning of the Twentieth Century. Higginbothams, 1964.
警告：這些引文格式不一定是100％准確.