1. Allen, D. (2020). Birds of the Philippines. Lynx Edicions, Barcelona, Spain.
2. Delacour, J., and E. Mayr (1946). Birds of the Philippines. Macmillan Co., New York, NY, USA.
3. Kennedy, R. S., P. C. Gonzales, E. C. Dickinson, H. C. Miranda, and T. H. Fisher (2000). A Guide to the Birds of the Philippines. Oxford University Press, Oxford, UK and New York, NY, USA.
4. Dickinson, E. C. (1989). A review of larger Philippine swiftlets of the genus Collocalia. Forktail 4:19–53.
5. McGregor, R. C. (1909). A Manual of Philippine Birds. Part 1. Bureau of Printing, Manila, Philippines.