Twort, A. C. (1994). Water supply (4th ed.). Edward Arnold.
Lua i Stíl Chicago (17ú heag.)Twort, A. C. Water Supply. 4th ed. London: Edward Arnold, 1994.
Lua MLA (8ú heag.)Twort, A. C. Water Supply. 4th ed. Edward Arnold, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.