Bloetscher, F. (2011). Utility management for water and wastewater operators. American Water Works Association.
Lua i Stíl Chicago (17ú heag.)Bloetscher, Frederick. Utility Management for Water and Wastewater Operators. Denver, Colo.: American Water Works Association, 2011.
Lua MLA (9ú heag.)Bloetscher, Frederick. Utility Management for Water and Wastewater Operators. American Water Works Association, 2011.
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