1. Abrams HK, Leonard AR (1950) Toxicology of organic phosphate insecticides. Calif Med 73: 183 – 186.
2. ACGIH (1991) Threshold limit values and biological exposure indices for 1991–92. Am Conf Governmental Ind Hyg, Cincinnati, OH, pp 48 – 51.
3. Ames RG, Mengle DC (1991) Analyzing cholinesterase measurements: Assumptions, statistics, and interpretations. J Occup Med 33 (2): 101 – 112.
4. California Administrative Code (1979) Title 3 (agriculture), article 23 (pesticide worker safety), parts 2479, field worker safety. Sacramento, CA (revised Jan 1979 ).
5. (CDFA) (1981) California crop and livestock reporting service. Sacramento, CA. CDFA (1972–84). Pesticide use reports, Sacramento, CA.