1. Anonymous. 2005. Soil Science Society of Turkey. International Soil Meeting (ISM) on soil sustaining life on earth, managing soil and technology, 2006. Retrieved 2 November, 2011, from http://www.toprak.org.tr/yayin.asp?id=56 .
2. APHA. 1992. Standard methods for the examination of water and wastewater. Washington, DC: American Public Health Association.
3. Arslan, N., A. Çiçek, C. Akkan, D. Kılınç, and E. Acı. 2010. Accumulation of heavy metals by earthworms in boron contaminated area (Kırka-Eskişehir). Zoology in the Middle East, Advances of Earthworm Taxonomy IV: 111–117.
4. ASTM. 1985. Preparation of biological samples for inorganic chemical analysis. 1. Annual Book of ASTM Standards, D-19, 740–747.
5. Budavari, S., M.J. O’Neal, A. Smith, P.E. Heckelman, and J.F. Kinneary. 1996. The Merck Index: An encyclopedia of chemicals, drugs, and biologicals. Whitehouse Station: Merck and Co.