American Water Works Association & ebrary, Inc. (2002). Safety practices for water utilities (6th ed.). American Water Works Association.
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Chicago-čujuhus (17. p.)
American Water Works Association juo Inc ebrary. Safety Practices for Water Utilities. 6th ed. Denver, CO: American Water Works Association, 2002.
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MLA-čujuhus (9. p.)
American Water Works Association juo Inc ebrary. Safety Practices for Water Utilities. 6th ed. American Water Works Association, 2002.
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