Não informado. (1881). Proceedings of the American Water Works Association. American Water Works Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Proceedings of the American Water Works Association. Denver, Colo: American Water Works Association, 1881.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Proceedings of the American Water Works Association. American Water Works Association, 1881.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.