Regassa, C., Tolcha, T., Gomoro, K. and Megersa, N. (2020) “Determination of Residue Levels of DDT and Its Metabolites in Khat and Cabbage Samples using QuEChERS Sample Preparation Method Combined with GC-MS Detection”, Ethiopian Journal of Sciences and Sustainable Development, 7(1), pp. 44-53. doi: 10.20372/ejssdastu:v7.i1.2020.119.