URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/model-optimization-and-performance-evaluation-of-hand-cranked-music-box-base-structure-manufactured-via-3d-printing-dcfcd07e645d245babe887e5e2daa016/9d73dc71-8479-11ee-abf0-e4434b0aade8