APA

Worldwatch Institute Reporton Progress Toward a Sustainable Society [New York], . (1992). State of the world 1992. New York: W. W. Norton.

Chicago

Worldwatch Institute Reporton Progress Toward a Sustainable Society [New York], . 1992. State of the world 1992. New York: W. W. Norton.

Harvard

Worldwatch Institute Reporton Progress Toward a Sustainable Society [New York], . (1992). State of the world 1992. New York: W. W. Norton.

MLA

Worldwatch Institute Reporton Progress Toward a Sustainable Society [New York], . State of the world 1992. New York: W. W. Norton. 1992.