T. H. Asian Soci Bangkok,
«ASEP newsletter». Asian Society for Environmental Protection, Bangkok, Thailand.
«Environment». Heldref Publications, Washington, DC, USA.
I. Ministry o IL,
«Israel environment bulletin». Israel, Ministry of the Environment, Jerusalem, Israel.
J. Walter, Alebon, K., y Klinsky, S.,
«Local governments' response to agenda 21: summary report of local agenda 21 survey with regional focus». International Council for Local Environmental Initiatives, Toronto, Ont, Canada, p. 20 p. : fig., photogr.
E. W. Steel y Ehlers, C. E.,
Municipal and rural sanitation, 6th ed.ª ed. New York, NY, USA: McGraw-Hill, p. xiv, 663 p. : fig., photogr., tab.
G. B. Conservati London,
«Network 21». Conservation Foundation, London, UK.
USAID -Washington, DC, US y Horsley and Witten -Sandwich, MA, US,
«Source water protection: a training manual for communities in Nicaragua». US Environmental Protection Agency (EPA), Washington, DC, USA, p. 57 p. : fig., fotographs.
I. N. Centre for Delhi,
«What's new at CSE». Centre for Science and Environment, New Delhi, India.