APA aipamena

(2000). Earth and its resources. New York: McGraw-Hill School division.

Chicago Style aipamena

Earth and Its Resources. New York: McGraw-Hill School division, 2000.

MLA aipamena

Earth and Its Resources. New York: McGraw-Hill School division, 2000.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.