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Lua i Stíl Chicago (17ú heag.)United States. Advisory Committee on the 1972 United Nations Conference on the Human Environment agus United Nations Conference on the Human Environment (1972 : Stockholm). Stockholm and Beyond: Report of the Secretary of State's Advisory Committee on the 1972 United Nations Conference on the Human Environment, May 1972. Washington, D. C: U. S. Govt. Print. Off, 1972.
Lua MLA (9ú heag.)United States. Advisory Committee on the 1972 United Nations Conference on the Human Environment agus United Nations Conference on the Human Environment (1972 : Stockholm). Stockholm and Beyond: Report of the Secretary of State's Advisory Committee on the 1972 United Nations Conference on the Human Environment, May 1972. U. S. Govt. Print. Off, 1972.