O. A. Heino, Takala, A. J., y Katko, T. S.,
«Challenges to Finnish water and wastewater services in the next 20–30 years ». European Water Association, EWA, Tampere, Finland, p. 20 p.; 1 fig., 2011.
M. Hantke-Domas,
«Control de precios de transferencia en la industria de agua potable y alcantarillado». United Nations Economic Commission for Latin America and the Caribbean (ECLAC), Santiago, Chile, p. 65 p. : boxes, fig., 2011.
H. Hoffmann, Platzer, C., von Münch, E., y Winker, M.,
«Technology review of constructed wetlands : subsurface flow constructed wetlands for greywater and domestic wastewater treatment». Deutsche Gesellschaft fur Internationale Zusammenarbeit, GIZ, Eschborn, Germany, p. 35 p.; 32 fig.; 10 tab., 2011.
R. Philip,
«Wastewater : exploring the options», vol. Module 5. ICLEI European Secretariat GmbH, Freiburg, Germany, p. 55 p.; 17 fig.; 3 tab.; boxes, 2011.
Emergency Water, Sanitation and Hygiene group, EWASH,
«Wastewater in the Occupied Palestinian Territory
», vol. 7. Emergency Water and Sanitation-Hygiene Group, EWASH, S.l., p. 4 p.; 2 photographs; 4 boxes; 1 cartoon, 2011.