URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/iop-conference-series--earth-and-environmental-science-purpose-led-publishing--find-out-more--paper---the-strategy-model-for-improving-the-i-dcfcd07e645d245babe887e5e2daa016/361761ed-d481-11ef-8115-00505691351c
