1. Szollosi-Nagy, A. In: Proceedings of the United Nations seminar, 25–26 November 2004, Delft, Netherlands.
2. Associated Press, Nairobi, Kenya. Tribal water row leaves 16 dead. South China Morning Post (SCMP); 26 January 2005.
3. Environment Transport and Works Bureau, HK Government. Consultation document for the harbour treatment scheme stage 2; October 2004.
4. Chu, K. Bio-treatment of waste water by Pistia stratiotes L. and its application in agriculture. MPhil thesis, The University of Hong Kong; 1997. p. 37–82.
5. Environmental Protection Department, HK Government. Water Quality Standards. 1991.