Não informado. (1969). Pollution Engineering. Technical Publishing Corporation.
Lua i Stíl Chicago (17ú heag.)Não informado. Pollution Engineering. Chicago, Ill: Technical Publishing Corporation, 1969.
Lua MLA (8ú heag.)Não informado. Pollution Engineering. Technical Publishing Corporation, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.