Hardenbergh, W. A. Water supply and purification.
Lua i Stíl Chicago (17ú heag.)Hardenbergh, W. A. Water Supply and Purification.
Lua MLA (8ú heag.)Hardenbergh, W. A. Water Supply and Purification.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.