G, M. M., 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”. African Journal of Emerging Issues, Vol. 1, no. 10, Oct. 2019, pp. 20-29, https://ajoeijournals.org/sys/index.php/ajoei/article/view/59.