APA
United Nations G. O. . E. C. F. E., United Nations G. O. . E. C. F. E., . (1989). Transboundary air pollution. New York: United Nation U S A.
Chicago
United Nations Government Of Economic Commission For Eurpoe, United Nations Government Of Economic Commission For Eurpoe, . 1989. Transboundary air pollution. New York: United Nation U S A.
Harvard
United Nations G. O. . E. C. F. E., United Nations G. O. . E. C. F. E., . (1989). Transboundary air pollution. New York: United Nation U S A.
MLA
United Nations Government Of Economic Commission For Eurpoe, United Nations Government Of Economic Commission For Eurpoe, . Transboundary air pollution. New York: United Nation U S A. 1989.
