Enlace original:
https://apps.who.int/iris/handle/10665/39313
Franceys, R
,
Pickford, John
,
Reed, R
,
World Health Organization
,
[A guide to the development of on-site sanitation / R. Franceys, J. Pickford & R. Reed, Guía para el desarrollo del saneamiento in situGuide de l' assainissement individuel]