Simarmata V, Damanik D, Purba DG. Analisis Willingness to Pay dan Persepsi Wisatawan Terhadap Konservasi Gajah Aek Nauli di Kabupaten Simalungun. JEK [Internet]. 2022 May 30 [cited 2024 May 10];4(1):1-13. Available from: https://jurnal.usi.ac.id/index.php/ekuilnomi/article/view/332