"Hokkaido". Seamless Digital Geological Map of Japan. Geological Survey of Japan, AIST. 2007. Retrieved 5 May 2010.
"SHIRETOKO-DAKE". Quaternary Volcanoes of Japan. Geological Survey of Japan, AIST. 2006. Archived from the original on 19 December 2012. Retrieved 5 May 2010.
archive.today
"SHIRETOKO-DAKE". Quaternary Volcanoes of Japan. Geological Survey of Japan, AIST. 2006. Archived from the original on 19 December 2012. Retrieved 5 May 2010.