Enlace original:
https://apps.who.int/iris/handle/10665/40505
Franceys, R
,
Pickford, John
,
Reed, R
,
World Health Organization
,
[A guide to the development of on-site sanitationGuide de l' assainissement individuel]
,
Gu'ia para el desarrollo del saneamiento in situ / R. Franceys, J. Pickford y R. Reed