Widyastutik, PanjaitanI., MalauF. and FahreizaY. (2020) “Strategi Peningkatan Daya Saing Sektor Jasa Pariwisata Indonesia: Studi Kasus Jasa Pariwisata Danau Toba dan Bali: Strategies for Increasing Competitiveness of Indonesia’s Tourism Services Sector: Case Study of Lake Toba And Bali Tourism Services”, Jurnal Aplikasi Bisnis dan Manajemen (JABM), 6(2), p. 356. doi: 10.17358/jabm.6.2.356.