Muhardina, Vina, et al. “Extrusion Encapsulation of Lactobacillus Bulgaricus Coated by Carrageenan – Alginate With Additional Tofu Waste Flour Prebiotic”. International Journal of Engineering & Technology, vol. 7, no. 4, Mar. 2019, pp. 5242-4, https://doi.org/10.14419/ijet.v7i4.24255.