1. Turton J. M. , Speight G. and Rowland R. (1986) Unpublished report on a birdwatching trip to the Philippines.
2. SSC [Swedish Space Corporation] (1988) Mapping of the natural conditions of the Philippines. Final Report, 30 April 1988.
3. SSC [Swedish Space Corporation] (1987) Land cover maps of the Philippines. 1:250 000.
4. Ripley S. D. and Rabor D. S. (1955) A new fruit pigeon from the Philippines. Postilla 21.
5. Birds of Negros Island;Rand;Fieldiana Zool,1951