1. AERC, (n.d.). The AERC National Export Coefficient Model. Aquatic Environments Research Centre, University of Reading, United Kingdom. www.defra.gov.uk/farm/environment/water/csf/pdf/ landuse-ges-append.pdf (accessed 15.11.07.).
2. Study on Control and Management of Rural Non-Point Source Pollution;ADB,2004
3. Songhua River Basin Water Quality and Pollution Control Management – Summary Report;ADB,2005
4. ADB, 2008. ADB invests in China wastewater treatment industry. Posted April 15, 2008. http://afp.google.com/article/ALeqM5g3OOPaGeWlH38p9YbF7rULvNIcRQ (accessed 07.10.08.).
5. Differences in phosphorus and nitrogen delivery to the Gulf of Mexico from the Mississippi River basin;Alexander;Environmental Science and Technology,2008