Skinner, Brian Shaw, Rod Chatterton, Ken Handpumps – An Overview: Part 3 of 6 – Direct action pumps Handpumps – An Overview: Part 3 of 6 – Direct action pumps Handpumps;International and Development Communication 2019-09-03
    https://repository.lboro.ac.uk/articles/media/Handpumps_An_Overview_Part_3_of_6_Direct_action_pumps/9759254
10.17028/rd.lboro.9759254.v1