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Piper, P. J.; Ochoa, J.; Lewis, H.; Paz, V.; Ronquillo, W. P. (2008). "The first evidence for the past presence of the tiger Panthera tigris (L.) on the island of Palawan, Philippines: extinction in an island population". Palaeogeography, Palaeoclimatology, Palaeoecology. 264 (1–2): 123–127. Bibcode:2008PPP...264..123P. doi:10.1016/j.palaeo.2008.04.003.
"Islands of Philippines". Island Directory. United Nations Environment Programme. Archived from the original on 28 April 2019. Retrieved 28 February 2017.
web.archive.org
"Islands of Philippines". Island Directory. United Nations Environment Programme. Archived from the original on 28 April 2019. Retrieved 28 February 2017.