“PERAMALAN PENDAPATAN RETRIBUSI PERSAMPAHAN PADA TPA REGIONAL SOLOK MENGGUNAKAN METODE HOLT DOUBLE EXPONENTIAL SMOOTHING”. JOURNAL OF SCIENCE AND SOCIAL RESEARCH 9, no. 5 (October 10, 2026): 7603 – 7608. Accessed October 10, 2026. https://jurnal.goretanpena.com/index.php/JSSR/article/view/7245.