Giorgi, J. (2007). Math for water treatment operators: Practice problems to prepare for water treatment operator certification exams. American Water Works Association.
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Čikaški stil citiranja (17. izdanje)
Giorgi, John. Math for Water Treatment Operators: Practice Problems to Prepare for Water Treatment Operator Certification Exams. Denver, Colo.: American Water Works Association, 2007.
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MLA način citiranja (9. izdanje)
Giorgi, John. Math for Water Treatment Operators: Practice Problems to Prepare for Water Treatment Operator Certification Exams. American Water Works Association, 2007.
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