1. R. M. Cornell and U.Schwertmann, The iron oxides, structure, properties, reactions, occurrence and uses, VCH Weinheim Germany Publishers(1996)
2. The cycling of iron in natural environments: Considerations based on laboratory studies of heterogeneous redox processes
3. S. Mann , J.Webb and R. J. P.Williams, Biomineralization, Chemical and Biochemical Perspectives. VCH Weinheim Germany Publishers(1989)
4. A. F. Wells , Structural Inorganic Chemistry, 5th ed., Oxford University Press, Oxford(1991)