Não informado. (1967). Air pollution abstracts. Warren Spring Laboratory, Hertsford.
Lua i Stíl Chicago (17ú heag.)Não informado. Air Pollution Abstracts. Stevenage, Inglaterra: Warren Spring Laboratory, Hertsford, 1967.
Lua MLA (8ú heag.)Não informado. Air Pollution Abstracts. Warren Spring Laboratory, Hertsford, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.