APA (7th ed.) Citation

United States. Congress. Commission on Security and Cooperation in Europe & ProQuest (Firm). (1990). Implementation of the Helsinki accords: Hearing before the Commission on Security and Cooperation in Europe, One Hundredth First Congress, first session, Sofia CSCE meeting on the protection of the environment, September 28, 1989. U.S. G.P.O..

Chicago Style (17th ed.) Citation

United States. Congress. Commission on Security and Cooperation in Europe and ProQuest (Firm). Implementation of the Helsinki Accords: Hearing Before the Commission on Security and Cooperation in Europe, One Hundredth First Congress, First Session, Sofia CSCE Meeting on the Protection of the Environment, September 28, 1989. Washington: U.S. G.P.O., 1990.

MLA (9th ed.) Citation

United States. Congress. Commission on Security and Cooperation in Europe and ProQuest (Firm). Implementation of the Helsinki Accords: Hearing Before the Commission on Security and Cooperation in Europe, One Hundredth First Congress, First Session, Sofia CSCE Meeting on the Protection of the Environment, September 28, 1989. U.S. G.P.O., 1990.