S. A. Marliyati, D. Martianto, N. Andarwulan, and S. Fauzi, “Efficacy of Non-Branded Cooking Oil Fortified with Carotene from RPO on Blood Retinol and IgG of Children Aged 7-9 Years”, Pak. J. Nutr., vol. 15, no. 5, pp. 419–426, Apr. 2016, doi: 10.3923/pjn.2016.419.426.