Sembiring, D. J. M., S. M. Br Perangin-angin, A. Br Surbakti, and D. P. S. Br Ginting. “Development Of An Android Based Application For A Certification Management Information System For A Certification Institute: Design And Implementation”. Jurnal Info Sains : Informatika Dan Sains, vol. 14, no. 02, May 2024, pp. 82-92, doi:10.54209/infosains.v14i02.4291.