URL dokumen:
https://prisma.simaster.ugm.ac.id/karya_files/the-effect-of-countdown-timer-with-running-text-at-signalized-intersection--an-empirical-study-dcfcd07e645d245babe887e5e2daa016/de2f8397-2c69-11f0-ae8a-e4434b0aa6de