Watthanaphap, N., Natakankitkul, S. and Jonglaekha, N. 2017. DETERMINATION OF CHLORPYRIFOS IN LETTUCE (LACTUCA SATIVA L.) BY MICROWAVE-ASSISTED EXTRACTION COUPLED WITH HEADSPACE SINGLE DROP MICROEXTRACTION. International Journal of Pharmacy and Pharmaceutical Sciences. 9, 5 (May 2017), 248–255. DOI:https://doi.org/10.22159/ijpps.2017v9i5.16849.