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Cahyadin, Yusup and Jepson, Paul and Arif, Sukari (2012) Laporan No. 2. Status Cacatua sulphurea abbotti di Kepulauan Masalembo.
Cahyadin, Yusup and Jepson, Paul and Syarief, Masykur (2012) Laporan No. 3. Telaah Singkat Status Cacatua sulphurea sulphurea di Propinsi Sulawesi Selatan, Indonesia.
Suherdie, Erdie and Basuki, Minto and Cahyadin, Yusup and K, Michael and Poulsen (2012) Memorandum Teknis No. 8. Telaah Awal Batas-batas Kawasan Konservasi di Halmahera, Maluku Utara.