Skinner, Brian Shaw, Rod Chatterton, Ken Handpumps – An Overview: Part 1 of 6 – Introduction Handpumps – An Overview: Part 1 of 6 – Introduction Handpumps;International and Development Communication 2019-09-03
    https://repository.lboro.ac.uk/articles/media/Handpumps_An_Overview_Part_1_of_6_Introduction/9758924
10.17028/rd.lboro.9758924.v1