METCALF. Wastewater engineering: Treatment and reuse.fourth ed. Mc Graw Hill.
Chicago-viite (17. p.)METCALF. Wastewater Engineering: Treatment and Reuse.fourth Ed. Mc Graw Hill.
MLA-viite (8. p.)METCALF. Wastewater Engineering: Treatment and Reuse.fourth Ed. Mc Graw Hill.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.