Phonsiri Sayaphan และ Puttaruksa Varanusupakul. (2012) Sample preparation by dispersive liquid-liquid microextraction for determination of pesticide residues in ginger. Chulalongkorn University:ม.ป.ท.Phonsiri Sayaphan และ Puttaruksa Varanusupakul. 2012. Sample preparation by dispersive liquid-liquid microextraction for determination of pesticide residues in ginger. ม.ป.ท.:Chulalongkorn University;Phonsiri Sayaphan และ Puttaruksa Varanusupakul. Sample preparation by dispersive liquid-liquid microextraction for determination of pesticide residues in ginger. ม.ป.ท.:Chulalongkorn University, 2012. Print.