Piarasd, L., K. Holasut, and P. Kwakhong. “Comparative of Chemical Composition and Energy of Zingiber Officinale Rosc. Essential Oil Using Conventional and Microwave Hydro Diffusion-Gravity Methods”. Engineering and Technology Horizons, vol. 36, no. 3-4, Dec. 2019, pp. 1-8, https://ph01.tci-thaijo.org/index.php/lej/article/view/240119.