Von Sperling, M. (2007). Activated Sludge and Aerobic Biofilm Reactors. IWA Publishing.
Lua i Stíl Chicago (17ú heag.)Von Sperling, Marcos. Activated Sludge and Aerobic Biofilm Reactors. IWA Publishing, 2007.
Lua MLA (9ú heag.)Von Sperling, Marcos. Activated Sludge and Aerobic Biofilm Reactors. IWA Publishing, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.