Khanitchaidecha, W., S.T.T. Le, N. Yuangpho, and A. Nakaruk. 2014. “Synthesis of Adsorbent Materials from Vetiver Grass for Wastewater Treatment”. Naresuan University Engineering Journal 9 (1). Phitsanulok, Thailand:6-9. https://doi.org/10.14456/nuej.2014.10.