Anshori, M., R. M. Jafar, D. Lestari, and M. T. A. P. Kresnowati. “Production of Carotenoids from Oil Palm Empty Fruit Bunches: Selection of Extraction Methods”. Journal of Engineering and Technological Sciences, vol. 54, no. 3, May 2022, p. 220303, doi:10.5614/j.eng.technol.sci.2022.54.3.3.