Irfan, I., N. Nurhayati, and A. Asmawati. “Kajian Penambahan Ubi Jalar Ungu (Ipomoea Batatas Blackie) Terhadap Sifat Kimia Dan Sensoris Yoghurt Susu Kedelai: The Fortification of Purple Sweet Potato (Ipomoea Batatas Blackie) on Chemical and Sensory Properties of Soygurt”. Pro Food, vol. 7, no. 2, Jan. 2022, pp. 68-75, doi:10.29303/profood.v7i2.209.