Widati, Sekar Tri, et al. “USD EXCHANGE RATE CHANGES AND COAL PRICE FLUCTUATIONS: IMPACT ON INDONESIAN COAL EXPORTS”. Jurnal Pendidikan Ekonomi, Perkantoran, Dan Akuntansi, vol. 4, no. 3, Dec. 2023, pp. 83-94, doi:10.21009/jpepa.0403.09.