Dyfyniad APA

Worldwatch Institute & Brown, L. R. (1993). State of the world, 1993: A Worldwatch Institute report on progress toward a sustainable society. Norton.

Dyfyniad Arddull Chicago

Worldwatch Institute and Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. New York: Norton, 1993.

Dyfyniad MLA

Worldwatch Institute and Lester Russell Brown. State of the World, 1993: A Worldwatch Institute Report on Progress Toward a Sustainable Society. Norton, 1993.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.