BINNIE, C., M. KIMBER. Basic water treatment. 4 ed. London:Thomas Telford, 2009. ISBN 978-0-7277-3608-6.
TANDOI, V., D. JENKINS and J. WANNER, ed. Activated sludge separation problems: theory, control measures, practical experience. London:IWA Publishing, 2006. Scientific and technical report series, no. 16. ISBN 1-900222-84-1.
SPERLING, M.V. Activated sludge and aerobic biofilm reactors. London: IWA Publishing, 2007.
TUROVSKIY I.S. and P.K. MATHAI. Wastewater sludge processing. Hoboken:Wiley, 2005. ISBN 0-471-79161-X .