Παραπομπή APA

Brown,Lester R. (1997). State of the world 1998: A world watch institute report on progress toward a sustainable society. W W Norton & Company.

Παραπομπή Chicago Style

Brown,Lester R. State of the World 1998: A World Watch Institute Report on Progress Toward a Sustainable Society. New York: W W Norton & Company, 1997.

Παραπομπή MLA

Brown,Lester R. State of the World 1998: A World Watch Institute Report on Progress Toward a Sustainable Society. W W Norton & Company, 1997.