(1989). Formaldehyde. World Health Organization.
Lua i Stíl Chicago (17ú heag.)Formaldehyde. Ginebra: World Health Organization, 1989.
Lua MLA (9ú heag.)Formaldehyde. World Health Organization, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.