SulmiyatiS., SaidN. S., FahrodiD. U., MalakaR., and MaruddinF., “The Physicochemical, Microbiology, and Sensory Characteristics of Kefir Goat Milk with Different Levels of Kefir Grain”, Trop. Anim. Sci. J., vol. 42, no. 2, pp. 152-158, Jul. 2019.