1. Shoemaker, J.D., and Elliot, W.H. (1991) Automated Screening of Urine Samples for Carbohydrates, Organic and Amino Acids after Treatment with Urease. Journal of Chromatography, 562: 125–138.
2. Goodman, S.I. and Markey, S.P. (1981) Diagnosis of Organic Acidemias by Gas Chromatography-Mass Spectrometry. Laboratory and Research Methods in Biology and Medicine, Volume 6. Alan R. Liss, Inc., New York.
3. Sweetman, L. (1991) Organic acid analysis, in Techniques in Diagnostic Human Biochemical Genetics: A Laboratory Manual. (Hommes, F.A., ed), Wiley-Liss, New York, pp. 143–176.
4. American College of Medical Genetics. (2006) F: Clinical biochemical genetics, in Standards and Guidelines for Clinical Genetics Laboratories.
http://www.acmg.net/Pages/ACMG_Activities/stds-2002/f.htm