United Nations. Economic Commission for Europe. (1984). Strategies, technologies and economics of waste water management in ECE countries: A report on prevailing practice and recent experience in domestic sewage purification and industrial waste-water treatment with special emphaisis on advanced techniques. United States.
Παραπομπή σε μορφή Chicago (17η εκδ.)United Nations. Economic Commission for Europe. Strategies, Technologies and Economics of Waste Water Management in ECE Countries: A Report on Prevailing Practice and Recent Experience in Domestic Sewage Purification and Industrial Waste-water Treatment with Special Emphaisis on Advanced Techniques. New York: United States, 1984.
Παραπομπή σε μορφή MLA (9th εκδ.)United Nations. Economic Commission for Europe. Strategies, Technologies and Economics of Waste Water Management in ECE Countries: A Report on Prevailing Practice and Recent Experience in Domestic Sewage Purification and Industrial Waste-water Treatment with Special Emphaisis on Advanced Techniques. United States, 1984.