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Soemardi, R and Kesuma, Ratna and Warlina, Lina and Suparman, M. Atwi and Padmo, Dewi Artati and Adji, Sandra Sukmaning and Suroyo, and Mahdi, Mas (1995) Studi Pengembangan Model Baru Bahan Belajar Universitas Terbuka. Project Report. Universitas Terbuka, Jakarta.