Dyfyniad APA
Pollard, S. J. T., & Stephenson, T. (2016). Risk management for water and wastewater utilities (Second edition.). IWA Publishing.
Dyfyniad Arddull Chicago
Pollard, Simon J. T., and Tom Stephenson. Risk Management for Water and Wastewater Utilities. Second edition. London, England: IWA Publishing, 2016.
Dyfyniad MLA
Pollard, Simon J. T., and Tom Stephenson. Risk Management for Water and Wastewater Utilities. Second edition. IWA Publishing, 2016.
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