Mallari, N. A. D., Tabaranza, B. R. Jnr and Crosby, M. J. (2001) Key Conservation Sites in the Philippines: a Haribon Foundations and BirdLife International directory of Important Bird Areas. Makati City: Bookmark.
Recommended Citation BirdLife International (2021) Country profile: Philippines. Available from http://www.birdlife.org/datazone/country/philippines. Checked: 2021-03-04