APA引文

National Geographic Society. (2000). Forces. New York: McGraw-Hill School Division.

Trích dẫn kiểu Chicago

National Geographic Society. Forces. New York: McGraw-Hill School Division, 2000.

MLA引文

National Geographic Society. Forces. New York: McGraw-Hill School Division, 2000.

警告：这些引文格式不一定是100％准确.