1. Agency for Toxic Substances and Disease Registry (ATSDR) (2005). Toxicological profile for alpha-, beta-, gamma- and delta-hexachlorocyclohexane. Atlanta: U.S. Department of Health and Human Services, Public Health Service.
2. Ahad, K., Anwar, T., Ahmad, I., Mohammad, A., Tahir, S., Aziz, S., et al. (2000). Determination of insecticide residues in groundwater of Mardan Division, NWFP, Pakistan: A case study. Water SA, 26, 409–412.
3. Ahad, K., Mohammad, A., Mehboob, F., Sattar, A., & Ahmad, I. (2006). Pesticide residues in Rawal Lake, Islamabad, Pakistan. Bulletin of Environmental Contamination and Toxicology, 76, 463–470.
4. Albanis, T., Goutner, V., Konstantinou, I., & Frigis, K. (2003). Organochlorine contaminants in eggs of the yellow-legged gull (Larus cachinnans michaellis) in the Northeastern Mediterranean: Is this gull a suitable biomonitor for the region? Environmental Pollution, 126, 245–255.
5. Ambrus, A., & Miller, J. N. (2003). Manual on basic statistics. Vienna: IAEA.