1. Alloway, B. J. (1990). Heavy metals in soils. New York: Wiley.
2. Almås, A. R., Lombnæs, P., Sogn, T. A., & Mulder, J. (2006). Speciation of Cd and Zn in contaminated soils assessed by DGT-DIFS, and WHAM/Model VI in relation to uptake by spinach and ryegrass. Chemosphere, 62, 1647–1655.
3. Bermond, A. (1999). Caractérisation chimique de la spéciation des métaux traces dans les sols. In ECRIN (Ed.), Spéciation des métaux dans le sol (pp. 73–95). Paris: Les cahiers des clubs CRIN.
4. Blackmore, L. C., Searle, P. L., & Daly, B. K. (1987). Methods for chemical analysis of soils. New Zealand soil Bureau Scientific, Report 80.
5. Cappuyns, V., Van Herreweghe, S., Swennen, R., Ottenburgs, R., & Deckers, J. (2002). Arsenic pollution at the industrial site of Reppel-Bocholt (north Belgium). The Science of the Total Environment, 295, 217–140.