1. Balance of Payments Statistics Team, Statistics and Information Systems Department, “Trade classified by country 2017,” Bank of Thailand, Customs Department, Ministry of Finance. 28 Feb 2017, http://www2.bot.or.th/statistics/BOTWEBSTAT.aspx?reportID=745&language=ENG (2 Mar 2017).
2. World Health Organization, “WHO specifications and evaluations for public health pesticides,” Mar 2009, http://www.who.int/whopes/quality/Chlorpyrifos_WHO_specs_eval_Mar_2009.pdf (2 Mar 2017).
3. Simultaneous determination of three acidic herbicide residues in food crops using HPLC and confirmation via LC-MS/MS
4. Determination of organophosphorus pesticides and their transformation products in river waters by automated on-line solid-phase extraction followed by thermospray liquid chromatography-mass spectrometry