M. M. . G, L. J. . O, M. . J., and W. V. . W, “DETERMINATION OF LEVELS OF ORGANOPHOSPHORUS PESTICIDE RESIDUES IN KALES, TOMATOES AND FRENCH BEANS FROM MERU COUNTY, KENYA BY GC-MS”, AJOEI, vol. 1, no. 10, pp. 20–29, Oct. 2019.