United States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution. (1970). Water pollution--1970: Hearings, Ninety-first Congress, second session, on S.3687, S.3468, S.3470, S.3471, S.3472, S.3181, S.3484, S.3500, S.3507, S.3614, S.3688, and S.3697 .. U.S. Govt. Print. Off..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution. Water Pollution--1970: Hearings, Ninety-first Congress, Second Session, on S.3687, S.3468, S.3470, S.3471, S.3472, S.3181, S.3484, S.3500, S.3507, S.3614, S.3688, and S.3697 .. Washington: U.S. Govt. Print. Off., 1970.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)United States. Congress. Senate. Committee on Public Works. Subcommittee on Air and Water Pollution. Water Pollution--1970: Hearings, Ninety-first Congress, Second Session, on S.3687, S.3468, S.3470, S.3471, S.3472, S.3181, S.3484, S.3500, S.3507, S.3614, S.3688, and S.3697 .. U.S. Govt. Print. Off., 1970.