Cita APA (7th ed.)

Worldwatch Institute. (2006). State of the world 2006: A Worldwatch Institute report on progress toward a sustainable society. W.W. Norton & Company, Inc.

Cita Chicago (17th ed.)

Worldwatch Institute. State of the World 2006: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: W.W. Norton & Company, Inc, 2006.

Cita MLA (9th ed.)

Worldwatch Institute. State of the World 2006: A Worldwatch Institute Report on Progress Toward a Sustainable Society. W.W. Norton & Company, Inc, 2006.