Puteh AQ, Mohd Shahrome AA, Haji Razali MH, Sulaiman A. Comparative Study of Carotenoids Content in Ripe and Unripe Oil Palm Fresh Fruit Bunches. IJIE. 2022;14(9):240-246. Accessed August 7, 2026. https://journal.uthm.edu.my/index.php/ijie/article/view/11933