Y.C. Wong, N. Norsyamimi, and W.A. Wan-Nurdiyana. 2021. “Determination of Paraquat (Herbicide) Residue Level in Sandy Clay Loam Soil Using High Performance Liquid Chromatography”. Journal of Basic & Applied Sciences 9 (October):566-77. https://doi.org/10.6000/1927-5129.2013.09.73.