Great Britain. Working Party on the Disposal of Sewage Sludge to Land & Great Britain. Standing Committee on the Disposal of Sewage Sludge. (1977). Report of the Working Party on the Disposal of Sewage Sludge to Land. Dept. of the Environment : Available only from National Water Council.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Great Britain. Working Party on the Disposal of Sewage Sludge to Land و Great Britain. Standing Committee on the Disposal of Sewage Sludge. Report of the Working Party on the Disposal of Sewage Sludge to Land. London: Dept. of the Environment : Available only from National Water Council, 1977.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Great Britain. Working Party on the Disposal of Sewage Sludge to Land و Great Britain. Standing Committee on the Disposal of Sewage Sludge. Report of the Working Party on the Disposal of Sewage Sludge to Land. Dept. of the Environment : Available only from National Water Council, 1977.