“Processing of Red Velvet Cake Using Natural Dyes of Red Bitter Fruit (Beta Vulgaris) And Red Spinach (Amaranthus Tricolor Linn)”. Agricultural Science, vol. 4, no. 2, July 2021, pp. 126-32, https://agriculturalscience.unmerbaya.ac.id/index.php/agriscience/article/view/55.