Hopkins, D. C., W. D. Clark, T Matuschka, and J. C. Sinclair. “The Philippines Earthquake of July 16, 1990”. Bulletin of the New Zealand Society for Earthquake Engineering 24, no. 1 (March 31, 1991): 3-95. Accessed April 12, 2021. https://bulletin.nzsee.org.nz/index.php/bnzsee/article/view/738.