1. Federal Register 62, 215:60098-99, Nov 6, 1997
2. Drug-analysis technology: Overview and state of the art;Finkle;Clin Chem,1987
3. Foltz RL, Fentiman AF, Foltz RB: GC/MS assays for abused drugs in body fluids. NIDA Monograph No. 32, DHHS Pub. No. (ADM) 80-1014, Washington, DC, 1980
4. Guidance Document for Laboratories and Inspectors, National Laboratory Certification Program, DHHS Center for Substance Abuse publication, August 29, 1994
5. Handbook of Derivatives for Chromatography,1978