R. Hahn y Johansson, P.,
«Handpump testing and development: part 5 : the second year-results of completed and ongoing test». Lund University, Institute of Technology, Department of Environmental Engineering, Lund, Sweden, p. 50 p.: fig., tab., 1985.
S. Krishna,
«Handpumps for health : water use in village India». UNICEF Regional Office for South Central Asia, New Delhi, India, p. 16 p.: fig., tab., 1985.