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2. Agency for Toxic Substances and Disease Registry. (2001). Toxic substances portal: Polychlorinated biphenyls (PCBs). Retrieved from http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=140&tid=26
3. Agency for Toxic Substances and Disease Registry. (2003). Toxic substances portal: Atrazine. Retrieved from http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=854&tid=59
4. Agency for Toxic Substances and Disease Registry. (2004). Toxic substances portal: Polybrominated diphenyl ethers (PBDEs). Retrieved from http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=900&tid=183
5. Agency for Toxic Substances and Disease Registry. (2007). Toxic substances portal: Benzene. Retrieved from http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=38&tid=14