APA (7th ed.) Citation

(1991). United States-Canada air quality agreement. United States Environmental Protection Agency, Air and Radiation.

Chicago Style (17th ed.) Citation

United States-Canada Air Quality Agreement. [Washington, D.C.]: United States Environmental Protection Agency, Air and Radiation, 1991.

MLA (9th ed.) Citation

United States-Canada Air Quality Agreement. United States Environmental Protection Agency, Air and Radiation, 1991.