Não informado. (1970). Air pollution abstracts. Air Pollution Technical Information Center.
Chicago-referens (17:e uppl.)Não informado. Air Pollution Abstracts. Research Triangle Park, NC: Air Pollution Technical Information Center, 1970.
MLA-referens (8:e uppl.)Não informado. Air Pollution Abstracts. Air Pollution Technical Information Center, 1970.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.