1. Adriano, D. (2001). Trace elements in terrestrial environments: Biogeochemistry, bioavailability and risks of metals. New York: Springer.
2. Ahmann, D., Krumholz, L., Hemond, H., Lovley, D., & Morel, F. (1997). Microbial mobilization of arsenic from sediments of the Aberjona watershed. Environmental Science and Technology, 31, 2923–2930.
3. Ahmed, M., Brandstetter, A., Wenzel,W., & Blum, W. (1997). The Arsenic calamity in Bangladesh. In 4th international conference on the biogeochemistry of trace elements (pp. 263–264). Berkeley: University of California.
4. Allard, B. (1995). Groundwater. In B. Salbu & E. Steinnes (Eds.), Trace elements in natural waters (pp. 151–176). Boca Raton: CRC Press.
5. American Public Health Association. (1989). Standard methods for the examination of water and wastewater. New York: American Public Health Association.