(1999). State of the world 1999: A worldwatch Institute report on progress toward a sustainable society. New York: Norton.
Chicago-stil citatState of the World 1999: A Worldwatch Institute Report On Progress Toward a Sustainable Society. New York: Norton, 1999.
MLA-referensState of the World 1999: A Worldwatch Institute Report On Progress Toward a Sustainable Society. New York: Norton, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.