APA

Brown L. R., Starke L. & Worldwatch Institute (Washington D. C.). (1993). State of the world 1993. New York: W. W. Norton.

Chicago

Brown Lester Russell, Starke Linda and Worldwatch Institute (Washington D. C.). 1993. State of the world 1993. New York: W. W. Norton.

Harvard

Brown L. R., Starke L. and Worldwatch Institute (Washington D. C.). (1993). State of the world 1993. New York: W. W. Norton.

MLA

Brown Lester Russell, Starke Linda and Worldwatch Institute (Washington D. C.). State of the world 1993. New York: W. W. Norton. 1993.