APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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