American Water Works Association, ebrary, Inc, & Stubbart, J. M. (2006). AWWA wastewater operator field guide. American Water Works Association.
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Chicago-čujuhus (17. p.)
American Water Works Association, Inc ebrary, juo John M. Stubbart. AWWA Wastewater Operator Field Guide. Denver, Colo.: American Water Works Association, 2006.
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MLA-čujuhus (9. p.)
American Water Works Association, et al. AWWA Wastewater Operator Field Guide. American Water Works Association, 2006.
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