APA (7 ম সংস্করণ) উদ্ধৃতি

(1990). State of the world 1990, a world in watch institute report on progress toward a sustainable society. Unwin.

শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতি

State of the World 1990, a World in Watch Institute Report on Progress Toward a Sustainable Society. Unwin, 1990.

M.L.A (9 ম সংস্করণ) উদ্ধৃতি

State of the World 1990, a World in Watch Institute Report on Progress Toward a Sustainable Society. Unwin, 1990.