1. Alloway, B. J. (2012). Sources of heavy metals and metalloids in soils. In B. J. Alloway (Ed.), Heavy metals in soils (3rd ed., pp. 11–50). Dordrecht: Springer (Chap. 2, This Volume).
2. Alloway, B. J., & Jackson, A. P. (1991). The behaviour of heavy metals in sewage sludge-amended soils. Science of the Total Environment, 100, 151–176.
3. Antonovics, J., Bradshaw, A. D., & Turner, R. G. (1971). Heavy metal tolerance in plants. Advances in Ecological Research, 7, 1–85.
4. Appel, C., & Ma, L. (2002). Concentration, pH, and surface charge effects on cadmium and lead sorption in three tropical soils. Journal of Environmental Quality, 31, 581–589.
5. Asami, T., Kubota, M., & Orikasa, K. (1995). Distribution of different fractions of cadmium, zinc, lead, and copper in unpolluted and polluted soils. Water, Air, and Soil Pollution, 83, 187–194.