I. N. Central Wa Delhi,
“Bhagirath”. India, Central Water Commission, New Delhi, India.
“Biogas newsletter Nepal”. Consolidated Management Services Nepal, Kathmandu, Nepal.
“BioMed Central Public Health”. BioMed Central, BMC, London, UK.
Biosphere Environment and Health Systems Series. Quezon City, The Philippines: Philippine Center for Water and Sanitation - The International Training Network (ITN) Foundation.
“The blue pages”. International Water Association, London, UK.
T. Jonch-Clausen, Bjerg, C., Copenhagen, D. K. Copenhagen, and DK), M. - Copenhag,
“The blue revolution : adapting to climate change”, vol. 6. Copenhagen Climate Council, CCC, Copenhagen, Denmark.