APA Format
World Health Organization . (2014). Preventing diarrhoea through better water, sanitation and hygiene. : WHO
MLA Format
World Health Organization . Preventing diarrhoea through better water, sanitation and hygiene. : WHO, 2014
Australian/Harvard Format
World Health Organization . 2014. Preventing diarrhoea through better water, sanitation and hygiene. WHO, 
Warning: These citations may not always be 100% accurate.