APA ציטוט

a. (1998). World Resousces 1998 - 1999. New York: Oxford university press.

Trích dẫn kiểu Chicago

a. World Resousces 1998 - 1999. New York: Oxford university press, 1998.

ציטוט MLA

a. World Resousces 1998 - 1999. New York: Oxford university press, 1998.