APA
Brown Lester R,, . (1989). State of the World 1989 : A worldwatch institute report on progress toward a sustainable society. New Delhi: Prentice-Hall of India Pvt. Ltd.
Chicago
Brown Lester R,, . 1989. State of the World 1989 : A worldwatch institute report on progress toward a sustainable society. New Delhi: Prentice-Hall of India Pvt. Ltd.
Harvard
Brown Lester R,, . (1989). State of the World 1989 : A worldwatch institute report on progress toward a sustainable society. New Delhi: Prentice-Hall of India Pvt. Ltd.
MLA
Brown Lester R,, . State of the World 1989 : A worldwatch institute report on progress toward a sustainable society. New Delhi: Prentice-Hall of India Pvt. Ltd. 1989.