(2000). World Resousces, 1990 - 91: People and Ecosystems : the fraying web of life. Washington, D.C: World Resources Institute.
Style de citation ChicagoWorld Resousces, 1990 - 91: People and Ecosystems : The Fraying Web of Life. Washington, D.C: World Resources Institute, 2000.
Style de citation MLAWorld Resousces, 1990 - 91: People and Ecosystems : The Fraying Web of Life. Washington, D.C: World Resources Institute, 2000.
Attention : ces citations peuvent ne pas être correctes à 100%.