APA引文

a. (1987). World Resousces 1987. New York: Basic Books.

Trích dẫn kiểu Chicago

a. World Resousces 1987. New York: Basic Books, 1987.

MLA引文

a. World Resousces 1987. New York: Basic Books, 1987.

警告:這些引文格式不一定是100%准確.