Kajian daya dukung lingkungan objek dan daya tarik wisata taman wisata Grojogan Sewu, Tawangmangu (The Study on the Carrying Capacity an Attractiveness of Grojogan Sewu Tourism Object in Tawangmangu, Central Java, Indone - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 1999)