European Acrceditation Organization, EA-4/09 (2017) Accreditation for Sensory Testing Laboratories
.... (....) Douglas A. Skoog. "Principles of Instrumental Analysis", 6th Ed. Saunders College Publishing,
ATSDR (2019) Agency for Toxic Substances and Disease Registry (ATSDR). Toxic Substances Portal. Retrieved June 6, https://www.atsdr.cdc.gov/substances/index.asp
William Horwitz & Dr. George Latimer Editors (2007) Association of Official Analytical Chemists, Official Methods of Analysis of AOAC International 18th edition, 2007.