McMahon, Glenda Shaw, Rod Deep trench latrines - plan Deep trench latrines - plan WEDC;Emergency Sanitation;Technical;Diagram;International and Development Communication 2019-05-09
    https://repository.lboro.ac.uk/articles/figure/Deep_trench_latrines_-_plan/7873529
10.17028/rd.lboro.7873529.v1