Não informado. (2021). Environmental Health Criteria. World Health Organization.
Lua i Stíl Chicago (17ú heag.)Não informado. Environmental Health Criteria. Geneva, Suíça: World Health Organization, 2021.
Lua MLA (8ú heag.)Não informado. Environmental Health Criteria. World Health Organization, 2021.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.