Marliyati, Sri Anna, et al. “Efficacy of Red Palm Oil and Carrot Noodle on Blood Retinol, IgG and Nutritional Status of Children Aged 7-9 Years”. Pakistan Journal of Nutrition, vol. 13, no. 3, Feb. 2014, pp. 134–140, https://doi.org/10.3923/pjn.2014.134.140.