Thorsdottir Inga, Gunnarsdottir I, Ingolfsdottir S. E., and Palsson G. “Fruit and Vegetable Intake: Vitamin C and Beta-Carotene Intake and Serum Concentrations in Six-Year-Old Children and Their Parents”. Food & Nutrition Research (June 1, 2006): 71-76. Accessed March 28, 2024. https://foodandnutritionresearch.net/index.php/fnr/article/view/377.