Rashidi Othman, Fatimah Azzahra Mohd Zaifuddin, and Norazian Mohd Hassan, “Isolation and Purification of β-Carotene from Morinda citrifolia as HPLC Standard and Active Pharmaceutical Ingredient”, J. Pharm. Nutr. Sci., vol. 7, no. 3, pp. 95–99, Jun. 2017.