BBTác giả: Boedihardja, Y.K.; Người hướng dẫn: -; Người tham gia: Brussel, M.; van den Bosch, F.; Grigolon, A. (2018)
Indonesia, as a developing country, faces all these problems. In most Indonesian cities, the local PDA M (Perusahaan Daerah Air Minum, or Piped Water Supply Company) provides drinking water. Large portions of the population, however, do not use these services, and for a variety of reasons depend on groundwater sources instead. 
