Rim's Earthquakes, Tsunamis, and Volcanoes. ABC-CLIO. p. 247. ISBN 978-1-61069-297-7. Retrieved August 6, 2021. "Raymundo S. Punongbayan, 68; Leading Volcanologist"...
Rim's Earthquakes, Tsunamis, and Volcanoes. ABC-CLIO. pp. 89–90. ISBN 978-1-61069-297-7. Alexander E. Gates; David Ritchie (2006). Encyclopedia of Earthquakes...
Tsunamis, and Volcanoes. Santa Barbara, Calif.: ABC-CLIO. p. 249. ISBN 978-1-61069-297-7. "Volcanoes of the Philippines". Philippine Institute of Volcanology...