Spellman, F. R., & Drinan, J. E. (2001). The handbook for waterworks operator certification. Technomic.
Lua i Stíl Chicago (17ú heag.)Spellman, Frank R., agus Joanne E. Drinan. The Handbook for Waterworks Operator Certification. Lancaster, Penn: Technomic, 2001.
Lua MLA (9ú heag.)Spellman, Frank R., agus Joanne E. Drinan. The Handbook for Waterworks Operator Certification. Technomic, 2001.
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