Cita APA

(1999). State of the world 1999: A worldwatch Institute report on progress toward a sustainable society. New York: Norton.

Citación estilo Chicago

State of the World 1999: A Worldwatch Institute Report On Progress Toward a Sustainable Society. New York: Norton, 1999.

Cita MLA

State of the World 1999: A Worldwatch Institute Report On Progress Toward a Sustainable Society. New York: Norton, 1999.

Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.