Löffler, E.; Mackenzie, D. E.; Webb, A. W. (1980). “Potassium-argon ages from some of the Papua New Guinea highlands volcanoes, and their relevance to Pleistocene geomorphic history”. Journal of the Geological Society of Australia26 (7–8): 387–397. Bibcode: 1979AuJES..26..387L. doi:10.1080/00167617908729105.
Löffler, E.; Mackenzie, D. E.; Webb, A. W. (1980). “Potassium-argon ages from some of the Papua New Guinea highlands volcanoes, and their relevance to Pleistocene geomorphic history”. Journal of the Geological Society of Australia26 (7–8): 387–397. Bibcode: 1979AuJES..26..387L. doi:10.1080/00167617908729105.