Biblio

K. E. U. N. E. P. - Nairobi en Water Research Commission -Pretoria, ZA, WRC, Freshwater under threat in Africa - vulnerability assessment of freshwater resources to environmental change. Nairobi, Kenya: UNEP, United Nations Environment Programme, 2009, p. xv, 319 p. : Boxes, fig., tab.

IUCN -Gland, CH, International Union for Conservation of Nature, Gland, C. H. W. W. F. -, en Nairobi, K. E. U. N. E. P. -, “World conservation strategy for the 1990s”. World Conservation Union (IUCN), Gland, Switzerland, p. vi, 160 p.: tab., 1989.