M. A. Perez Rincon,
«Comparing the management of water services in Colombia's small towns and villages»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 13-14 : 1 tab., 2002.
«no. 8»,
Revista regulacion de agua potable y saneamiento basico. p. 230 p. : fig., tab., 2002.
G. Roldan,
«Treating industrial wastes in Colombia using water hyacinth»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 6-8 : 2 fig., 3 photogr., 1 tab., 2002.