Nandika, D., Y. A. Mulyani, D. M. Prawiradilaga, and D. Agustina. “MONITORING of Cacatua Sulphurea Abbotti POPULATION IN MASAKAMBING ISLAND, INDONESIA”. BIOTROPIA, vol. 27, no. 3, Dec. 2020, pp. 271-8, doi:10.11598/btb.0.0.0.1229.