“PREDICTING THE VARIABILITY OF COPPER AND ZINC IN LEAF AND SOIL OF OIL PALM PLANTED ON A 12 HA LAND USING GEOSPATIAL INFORMATION SYSTEM TECHNOLOGY”. Jurnal Teknologi (Sciences & Engineering) 77, no. 24 (December 13, 2015). Accessed December 20, 2024. https://journals.utm.my/jurnalteknologi/article/view/6717.