(1961). Air Pollution: An introduction. WHO.
Lua i Stíl Chicago (17ú heag.)Air Pollution: An Introduction. WHO, 1961.
Lua MLA (8ú heag.)Air Pollution: An Introduction. WHO, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.