Environmental Council of the States (U.S.). Sludge Management Task Committee of the Environmental Council, Environmental and Water Resources Institute (U.S.), ebrary, Inc, & Tyagi, R. D. (2009). Sustainable sludge management: Production of value added products. American Society of Civil Engineers.

Environmental Council of the States (U.S.). Sludge Management Task Committee of the Environmental Council, Environmental and Water Resources Institute (U.S.), Inc ebrary, and R. D. Tyagi. Sustainable Sludge Management: Production of Value Added Products. Reston, VA: American Society of Civil Engineers, 2009.

Environmental Council of the States (U.S.). Sludge Management Task Committee of the Environmental Council, et al. Sustainable Sludge Management: Production of Value Added Products. American Society of Civil Engineers, 2009.