Não informado. (1940). American Industrial Hygiene Association Quarterly. American Industrial Hygiene Association.
Lua i Stíl Chicago (17ú heag.)Não informado. American Industrial Hygiene Association Quarterly. Chicago, Ill: American Industrial Hygiene Association, 1940.
Lua MLA (8ú heag.)Não informado. American Industrial Hygiene Association Quarterly. American Industrial Hygiene Association, 1940.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.