AWWA Seminar on Recent Advances in Sludge Treatment and Disposal Washington, D.C., & American Water Works Association. Research Division. (1985). Proceedings: AWWA Seminar on Recent Advances in Sludge Treatment and Disposal : annual conference, Washington, D.C., June 23, 1985. American Water Works Association.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)AWWA Seminar on Recent Advances in Sludge Treatment and Disposal Washington, D.C., و American Water Works Association. Research Division. Proceedings: AWWA Seminar on Recent Advances in Sludge Treatment and Disposal : Annual Conference, Washington, D.C., June 23, 1985. Denver, Colo.: American Water Works Association, 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)AWWA Seminar on Recent Advances in Sludge Treatment and Disposal Washington, D.C., و American Water Works Association. Research Division. Proceedings: AWWA Seminar on Recent Advances in Sludge Treatment and Disposal : Annual Conference, Washington, D.C., June 23, 1985. American Water Works Association, 1985.