“DESKRIPSI PERMASALAHAN UPAYA PENGEMBANGAN PARIWISATA BERKELANJUTAN DI DANAU TOBA SUMATERA UTARA(PROBLEM DESCRIPTION OF SUSTAINABLE TOURISM DEVELOPMENT EFFORT ON TOBA LAKE NORTH SUMATERA)” (2019) Inovasi, 16(1), pp. 11–20. doi:10.33626/inovasi.v16i1.130.