(1987). Actived sludge: Manual of practice. Water Environment Federation.
Cita Chicago (17th ed.)Actived Sludge: Manual of Practice. Alexandría: Water Environment Federation, 1987.
Cita MLA (9th ed.)Actived Sludge: Manual of Practice. Water Environment Federation, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.