Não informado. (1970). Air pollution abstracts. Air Pollution Technical Information Center.
Lua i Stíl Chicago (17ú heag.)Não informado. Air Pollution Abstracts. Research Triangle Park, NC: Air Pollution Technical Information Center, 1970.
Lua MLA (8ú heag.)Não informado. Air Pollution Abstracts. Air Pollution Technical Information Center, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.