Supply and Demand Analysis of Ecotourism Potency at Danau Linting, Village of Sibunga-bunga Hilir, Subdistrict of STM Hulu, Regency of Deli Serdang - Ginting, Marthalena; Alumni Program Studi Kehutanan, Fakultas Pertanian, Universitas Sumatera Utara Jl. Tri Dharma Ujung No. 1 Kampus USU Medan 20155 (Program studi Kehutanan USU, 2013)