The Economist. (1997). The World in 1997. U.S.A: The Economist.
Trích dẫn kiểu ChicagoThe Economist. The World in 1997. U.S.A: The Economist, 1997.
MLA引文The Economist. The World in 1997. U.S.A: The Economist, 1997.
警告：這些引文格式不一定是100％准確.
APA引文