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Lua i Stíl Chicago (17ú heag.)Haandel, Adrianus C. van, agus Gatze Lettinga. Anaerobic Sewage Treatment: A Practical Guide for Regions with a Hot Climate. Chichester: Wiley, 1994.
Lua MLA (9ú heag.)Haandel, Adrianus C. van, agus Gatze Lettinga. Anaerobic Sewage Treatment: A Practical Guide for Regions with a Hot Climate. Wiley, 1994.
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