Gray, N. F. (2005). Water technology: An introduction for environmental scientists and engineers (Second edition.). Elsevier/Butterworth-Heinemann.
Lua i Stíl Chicago (17ú heag.)Gray, N. F. Water Technology: An Introduction for Environmental Scientists and Engineers. Second edition. Oxford: Elsevier/Butterworth-Heinemann, 2005.
Lua MLA (8ú heag.)Gray, N. F. Water Technology: An Introduction for Environmental Scientists and Engineers. Second edition. Elsevier/Butterworth-Heinemann, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.