Worthington, T.J.; Gregory, M.R.; Bondarenko, V. (1999). "The Denham caldera on Raoul Volcano: dacitic volcanism in the Tonga–Kermadec arc". Journal of Volcanology and Geothermal Research. 90 (1–2): 29–48. Bibcode:1999JVGR...90...29W. doi:10.1016/S0377-0273(99)00018-9.
Worthington, T.J.; Gregory, M.R.; Bondarenko, V. (1999). "The Denham caldera on Raoul Volcano: dacitic volcanism in the Tonga–Kermadec arc". Journal of Volcanology and Geothermal Research. 90 (1–2): 29–48. Bibcode:1999JVGR...90...29W. doi:10.1016/S0377-0273(99)00018-9.