“ANALISIS PERBANDINGAN METODE DOUBLE EXPONENTIAL SMOOTHING DAN DOUBLE MOVING AVERAGE PADA KASUS PERAMALAN PENJUALAN KOPI BUBUK DI LOPO MANDHELING COFFEE” (2025) JOURNAL OF SCIENCE AND SOCIAL RESEARCH, 8(3), pp. 4688–4694. doi:10.54314/jssr.v8i3.4199.