ROSYADI, I.; UDIN, J. S.; NOSKE, R. A.; MAHROJI, M. Breeding season of the Endangered White (Umbrella) Cockatoo, and possible competition for nest holes with Blyth’s (Papuan) Hornbill in North Maluku, Indonesia. KUKILA, v. 21, p. 35-42, 29 Jan. 2019.