URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/excellent-performance-of-hybrid-model-manufactured-via-additive-manufacturing-process-reinforced-with-gfrp-for-sport-climbing-equipment-dcfcd07e645d245babe887e5e2daa016/83642a09-cac2-11ed-97b5-e4434b0aade8