Cuenca del Plata : estudio para su planificacion y desarrollo, Republica del Paraguay-Proyecto Aquidaban, Desarrollo de la Región Nororiental.
Organization of American States.Department of Regional Development.
Paraguay.Ministry of Public Works and Communications.
Washington :  Secretaría de la Organización de los Estados Americanos, 
1975.
Study carried out by the Department of Regional Development of the Organization of American States in cooperation with the Ministry of Public Works and Communications of Paraguay.