Wardani, Ika, and Abdul Karim Batubara. “LIBRARY SERVICE SYSTEM IN POCKET (ONLINE BOOK RESERVATION) NORTH SUMATRA PROVINCIAL LIBRARY AND ARCHIVES OFFICE”. JURTEKSI (jurnal Teknologi dan Sistem Informasi) 9, no. 3 (June 22, 2023): 437-444. Accessed October 5, 2025. https://jurnal.stmikroyal.ac.id/index.php/jurteksi/article/view/2410.