United States. Superintendent of Documents. (1994). Environmental protection. U.S. G.P.O., Supt. of Docs.
芝加哥风格引文United States. Superintendent of Documents. Environmental Protection. Washington, DC: U.S. G.P.O., Supt. of Docs, 1994.
MLA引文United States. Superintendent of Documents. Environmental Protection. U.S. G.P.O., Supt. of Docs, 1994.
警告：这些引文格式不一定是100％准确.