Traiwiriyawong , Parichat, and Suratsawadee Kungsanant. 2020. “Potential of Palm Kernel Alkanolamide Surfactant for Enhancing Oil Recovery from Sandstone Reservoir Rocks: DOI: 10.32526/Ennrj.18.4.2020.32”. Environment and Natural Resources Journal 18 (4). Nakhon Pathom, Thailand:333-44. https://ph02.tci-thaijo.org/index.php/ennrj/article/view/239901.