Optimizing Graduate Competitiveness through Service with Mathematical Economics and OBE: Optimalisasi Daya Saing Lulusan melalui Pengabdian dengan Matematika Ekonomi dan OBE - Muhamad Yusup; Sondang Visiana Sihotang; Meriyana Sunengsih; Lakshmi Devi; Po Abas Sunarya (ADI Publisher, 2025)