Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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