1. Agyapong E 1999. Aquaculture in the Kumasi urban and peri-urban area. In: Adam M ed. Kumasi Natural Resource management Research Project - Kumasi Urban Natural Resources Studies. University of Greenwich UK: Natural Resources Institute 75-98.
2. AIT/CAF 2000. Fish seed quality in Southern Vietnam. State of the System report. Bangkok Thailand: Asian Institute of Technology Aquaculture Outreach Programme AIT Bangkok.
3. Biswas JK Santra SC 2000. Heavy metal levels in marketable vegetables and fishes in Calcutta Metropolitan Area India. In: Jana BB Banerjee RD Guterstam B Heeb J eds. Waste recycling and resource management in the developing world. Calcutta India: University of Kalyani and Switzerland: International Ecological Engineering Society 371-376.
4. Breaux A Farber S Day J 1995. Using natural coastal wetlands systems for wastewater treatment: an economic benefit analysis. Journal of Environmental Management 44:85-291.
5. Brix H 1999. How ‘green’ are aquaculture constructed wetlands and conventional wastewater treatment systems? Water Science and Technology 40(3):45-50.