1. Alloway, B. J. (1995). Cadmiun. In B. J. Alloway (Ed.), Heavy metals in soils (2nd ed., pp. 122–147). London: Blackie Academic and Professional An Imprint of Chapman and Hall.
2. American Public Health Association (2005). Standard methods for examination of water and wastewater, 21st ed, Centenial Edition Prepared and Published Jointly by APHA, AWWA and W.E.F., American Public Health Association 8001 Street NW, Wasington DC, 20001–3710
3. Andriano, D. C. (2002). Trace elements in terrestrial environments. biogeochemistry, bioavailability and risks of metals 2nd ed.
4. AOAC (1996). Official methods of analysis of AOAC international 16th ed. Publ. International Suite AOAC, 481 North Frederick Ave. Gaithersburg, Maryland 2027–2417, USA.
5. Asano, T. (1998). Wastewater reclamation and reuse. Book volume Lancaster-Pensylvania (pp. 1–880). Springer New York: Technomic.