“Working paper / ISS”. Institute of Social Studies, The Hague, The Netherlands.
Working paper / Save the Children. London, UK: Save the Children (UK).
Working paper series / Centre on Regulation and Competition. Manchester, UK: University of Manchester, Centre on Regulation and Competition.
Working papers on water supply and environmental sanitation / SKAT. St. Gallen, Switzerland: SKAT (Swiss Centre for Development Cooperation in Technology and Management).
Working papers / UNU-WIDER. Helsinki, Finland: UNU World Institute for Development Economics Research (WIDER).