1B. Malmqvist, S. Rundles, Threats to the running water ecosystems of the world, Environmental Conservation 29 (2002) 134-153.
2M. Meybeck, R. Helmer, The quality of rivers: From pristine stage to global pollution, Paleogeography, Paleoclimatolgy, Palaeo Ecology 75 (1989) 283-309.
3M. Meybeck, River water quality: Global ranges, time and space variabilities, proposal for some redefinitions, Verh. Internat. Verein. Limnol. 26 (1996) 81-96.
4H. Sioli, Tropical rivers as expression of their terrestrial environments, Springer-Verlag., Golley, F.B. & Medina, New York, 1975, pp. 275-288.
5R.G. Wetzel, Limnology, lake and rivers ecosystems, Academic press, 2001.
6E.P. Odum, Ecologia, Guanabara Koogan, 1988.
7F .A. Esteves, Fundamental limnology, Intersciences, 1998. (in Spanish).
8M. Bagalwa, The impact 01" land use on water quality of the river Iwiro, democratic republic of congo, central Africa, African Journal of Aquatic Science 31 (1) (2006) 137-143.
9C.O. Dubling-green, Seasonal and spatial variations in some physicochemical parameters of the river Bonny (Niger Delta), Acta Hydrobilogica (34) (1992) 3-17.
10R.E. Hecky, H. Bootsman, M.L. Kingdom, Impact of land use on sediment and nutrient yields in Lake MalawilNyassa (Africa), Journal of Great Lakes Research 29(2003) 139-156.
