Analisis Faktor Penyebab Perubahan Kontrak Pada Pekerjaan Pembangunan RS UPT Vertikal Surabaya : Analysis Factors Causing Contract Changes In The Construction Of UPT Vertical Hospital Surabaya RS UPT Vertikal Surabaya. CONCRETE [Internet]. 2025 May 28 [cited 2026 Jun. 16];3(01):10-7. Available from: https://ejournal.unitomo.ac.id/index.php/concrete/article/view/9958