American Water Works Association & Letterman, R. D. (1999). Water quality and treatment: A handbook of community water supplies (5th ed.). Mcgraw-Hill.
Chicago-viite (17. p.)American Water Works Association ja Raymond D. Letterman. Water Quality and Treatment: A Handbook of Community Water Supplies. 5th ed. Boston, Mass: Mcgraw-Hill, 1999.
MLA-viite (9. p.)American Water Works Association ja Raymond D. Letterman. Water Quality and Treatment: A Handbook of Community Water Supplies. 5th ed. Mcgraw-Hill, 1999.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.