Bhutan (1992): Towards sustainable development in a unique environment. Thimphu, National Environmental Secretariat.

Cox, W.E. (1989): Water and development: managing the relationship. Paris, UNESCO.

Engelman, E. and P. LeRoy (1993): Sustaining water. Population and the future of renewable water supplies. Washington, Population Action International.

Falkenmark, M. (1994): "Population, environment and development: a water perspective". In: Population, environment and development, pp. 99-116. New York, United Nations.

Falkenmark, M. and C. Widstrand (1992): "Population and water resources: a delicate balance". Population Bulletin (Population Reference Bureau), vol. 47 no. 3.

FAO (1994): Land degradation in South Asia: its severity, causes and effects upon the people. Rome.

FAO (1995): Country tables. Basic data on the agricultural sector. Rome.

Harrison, P.: The third revolution. Environment, population and a sustainable world. London, I.B.Tauris, 1992, pp. 107-108.

ISRIC (1991): World map of the status of human-induced soil degradation (by L.R. Oldeman, R.T.A. Hakkeling and W.G.Sombroek). Global Assessment of Soil Degradation (GLASOD). 2nd revised edition, Wageningen/Nairobi, UNEP.

Norse, D., C. James, B.J. Skinner and Q. Zhao: "Agriculture, land use and degradation", in An agenda of science for environment and development into the 21st century (Dooge et al., eds.). Cambridge, Cambridge University Press, 1992.

United Nations (1992): Nations of the Earth report. UNCED national reports summaries. New York.

UN (1993): Agenda 21: Programme of action for sustainable development. New York.

United Nations (1994a): World population prospects: the 1994 revision. New York.

United Nations (1994b): World urbanization prospects: the 1994 revision. New York.

World Resources Institute (1996): World resources 1996-97. New York-Oxford, Oxford University Press.