Windy Fadhilah Susanti, S. F. Ana Wati, and T. L. Indayanti Sugata, “UI/UX Design of the ‘PrintOn!’ Printing Services Marketplace for UMKM Photocopying and Printing Businesses Using the User Centered Design Method”, JTOS, vol. 8, no. 2, pp. 495 - 505, Dec. 2025.