National Conference on Drinking Water, Toft, P., Tobin, R. S., & Sharp, J. J. (1989). Drinking water treatment: Small system alternatives : proceedings of the Third National Conference on Drinking Water, St. John's, Newfoundland, Canada, June 12 to 14, 1988. Oxford: Pergamon Press.
Παραπομπή σε μορφή Chicago (17η εκδ.)National Conference on Drinking Water, Peter Toft, Richard S. Tobin, και J. J. Sharp. Drinking Water Treatment: Small System Alternatives : Proceedings of the Third National Conference on Drinking Water, St. John's, Newfoundland, Canada, June 12 to 14, 1988. Oxford: Pergamon Press, 1989.
Παραπομπή σε μορφή MLA (9th εκδ.)National Conference on Drinking Water, et al. Drinking Water Treatment: Small System Alternatives : Proceedings of the Third National Conference on Drinking Water, St. John's, Newfoundland, Canada, June 12 to 14, 1988. Oxford: Pergamon Press, 1989.