APA

Brown L., Flavin C. & Worldwatch Institute. (1997). Vital signs: 1997. New York: W. W. Norton & Cia.

Chicago

Brown Lester, Flavin Christopher and Worldwatch Institute. 1997. Vital signs: 1997. New York: W. W. Norton & Cia.

Harvard

Brown L., Flavin C. and Worldwatch Institute. (1997). Vital signs: 1997. New York: W. W. Norton & Cia.

MLA

Brown Lester, Flavin Christopher and Worldwatch Institute. Vital signs: 1997. New York: W. W. Norton & Cia. 1997.