Firdonsyah, A. and Putri, N.A. 2025. Meeting Room Booking System with WhatsApp Notification Feature Using Extreme Programming Methods in RS Muhammadiyah Lamongan . Sinkron : jurnal dan penelitian teknik informatika. 9, 3 (Jul. 2025), 1036-1049. DOI:https://doi.org/10.33395/sinkron.v9i3.14927.