APA aipamena

(2002). World resources 2000-2001: People and ecosystems: the fraying web of life. World Resources Institute.

Chicago Style aipamena

World Resources 2000-2001: People and Ecosystems: The Fraying Web of Life. Washington: World Resources Institute, 2002.

MLA aipamena

World Resources 2000-2001: People and Ecosystems: The Fraying Web of Life. World Resources Institute, 2002.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.