Não informado. (1951). Wastes engineering. R.H. Donnelley, Magazine Publishing Division.
Lua i Stíl Chicago (17ú heag.)Não informado. Wastes Engineering. New York: R.H. Donnelley, Magazine Publishing Division, 1951.
Lua MLA (8ú heag.)Não informado. Wastes Engineering. R.H. Donnelley, Magazine Publishing Division, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.