Firdonsyah, A. ., and N. A. Putri. “Meeting Room Booking System With WhatsApp Notification Feature Using Extreme Programming Methods in RS Muhammadiyah Lamongan ”. Sinkron : Jurnal Dan Penelitian Teknik Informatika, vol. 9, no. 3, July 2025, pp. 1036-49, doi:10.33395/sinkron.v9i3.14927.