Não informado. (1990). Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Research Journal of the Water Pollution Control Federation. Alexandria, Va: Water Pollution Control Federation, 1990.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation, 1990.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.