McMahon, Glenda Shaw, Rod Ventilation in VIP latrines 2 Ventilation in VIP latrines 2 WEDC;VIP Latrines;Technical;Diagram;International and Development Communication 2019-05-02
    https://repository.lboro.ac.uk/articles/figure/Ventilation_in_VIP_latrines_2/7957775
10.17028/rd.lboro.7957775.v1