F. Y. Ali, H. Hasanah, R. N. Kusumaningtyas, and S. L. Asmono, “Pengaruh Penambahan Ampas Kopi Terhadap Uji Organoleptik Cookies Berbahan Dasar Tepung Ubi Jalar Ungu : The Effect of Spent Coffee Grounds Addition on the Organoleptic Test of Cookies Made from Purple Sweet Potato Flour”, JIPH, vol. 7, no. 3, pp. 349–359, Nov. 2025.