1. Substance Abuse and Mental Health Services Administration, Department of Health and Human Services. Mandatory Guidelines for Federal Workplace Drug Testing Programs. Fed Regist. 1988;53:11970-11980.
2. Substance Abuse and Mental Health Services Administration, Department of Health and Human Services. Mandatory Guidelines for Federal Workplace Drug Testing Programs. Fed Regist. 1994;59:29908-29912.
3. Substance Abuse and Mental Health Services Administration, Department of Health and Human Services. Mandatory Guidelines for Federal Workplace Drug Testing Programs. Fed Regist. 1997;62:51118-51120.
4. Substance Abuse and Mental Health Services Administration, Department of Health and Human Services. Mandatory Guidelines for Federal Workplace Drug Testing Programs. Fed Regist. 2004;19643-19673.
5. Paul B, Jacobs A. Spectrophotometric detection of iodide and chromic (III) in urine after oxidation to iodine and chromate (VI). J Anal Toxicol. 2005;29:658-663.