バブヤン島
↑ Measured using Google Earth
1 2 "Babuyan Claro". Global Volcanism Program. Smithsonian Institution. 2013年4月9日閲覧。
↑ "Municipality/City: CALAYAN". Philippine Standard Geographic Code (PSGC) Interactive. Retrieved on 2013-04-01.
↑ アメリカ合衆国国立測地調査所(英語版) (1919). "United States Coast Pilot, Philippine Islands, Vol. 1". Government Printing Office, Washington.