V. Whitehead,
«The manufacture of direct action handpumps for use with domestic rainwater harvesting tanks», vol. TR-RWH09. University of Warwick, School of Engineering, Development Technology Unit, Warwick, UK, p. 28 p. : fig., tab., 2000.
E. Baumann,
Water lifting, vol. no. 7. St. Gallen, Switzerland: SKAT (Swiss Centre for Development Cooperation in Technology and Management), 2000, p. 78 p., 49 fig., 2 tab.