Biblio

M. de Villiers, Water : the fate of our most precious resource, Paperback. Boston, MA, USA: Houghton Mifflin Company, 2001, p. xvi, 352 p. : maps.

W. R. Jobin, Dams and disease : ecological design and health impacts of large dams, canals and irrigation systems. London, UK: E & FN Spon, 1999, p. xiv, 580 p. : fig., maps, photogr., tab.

M. M. El-Abagy y Kamel, M. M., «The coliphage test : a simple, rapid and economical method of assessing the quality of potable and natural waters in Egypt», Water quality bulletin, pp. p. 198-201: fig., tab., 1989.