Parker, H. W. (1975). Wastewater Systems Engineering Homer Parker W. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Parker, Homer W. Wastewater Systems Engineering Homer Parker W. Prentice-Hall, 1975.
Lua MLA (8ú heag.)Parker, Homer W. Wastewater Systems Engineering Homer Parker W. Prentice-Hall, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.