P. A. Pashkevich y Gass, T. E.,
«Philippine hand pump program (Barangay water program)», vol. no. 54. Water and Sanitation for Health Project (WASH), Arlington, VA, USA, p. vi, 435 p.: fig., tab., 1982.
D. Sharp y Graham, M.,
Village handpump technology : research and evaluation in Asia. Ottawa, Ont, Canada: International Development Research Centre (IDRC), 1982, p. 72 p.