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Khoirunniam, Alan (2025) Perancangan Sistem Informasi Pengadaan Bahan Baku Menggunakan Model Waterfall Guna Meningkatkan Efisiensi Sistem Purchasing (Studi Kasus : UD La Riz Mebel). (Design of Raw Material Procurement Information System Using the Waterfall Model to Improve the Efficiency of the Purchasing System (Case Study: UD La Riz Furniture)). Undergraduate thesis, Universitas 17 Agustus 1945 Surabaya.