Yasri, Desi, Yulia Setiani, and Febriyanto Febriyanto. “Analisis Willingness To Pay (WTP) Dalam Memenuhi Kebutuhan Air Di Kecamatan Bangkinang”. SAINSTEK 6, no. 2 (December 31, 2018): 23–28. Accessed February 24, 2026. https://ejournal.sttp-yds.ac.id/index.php/js/article/view/74.