APA (7th ed.) Citation

Worldwatch Institute & Brown, L. R. (1990). State of the world 1990: A Worldwatch Institute report on progress toward a sustainable society. W.W. Norton.

Chicago Style (17th ed.) Citation

Worldwatch Institute and Lester R. Brown. State of the World 1990: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York ; London: W.W. Norton, 1990.

MLA (9th ed.) Citation

Worldwatch Institute and Lester R. Brown. State of the World 1990: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton, 1990.