General Statistical Office. Statistical Year Book 2001. 2002
VSSS-NIAP. Soil Map of Vietnam. 1996, 1
World Bank. Red River Delta Master Plan. 1995, 2, 10-36
WALLING, D. E. Measuring sediment yield from river basins. Soil Erosion Research Methods. 1994, 39-80
NGUYEN, H. D. Impact of agro-chemical use on productivity and health in Vietnam. Economy and Environment Program for Southeast Asia Research Report. 1999, 1-71