"Doublet Pool". Geysers of Yellowstone. Geyser Observation and Study Association (GOSA). Archived from the original on 2010-10-10. Retrieved 2009-03-11.
"Doublet Pool". Old Faithful Area Tour. National Park Service. Archived from the original on 2009-03-04.
web.archive.org
"Doublet Pool". Geysers of Yellowstone. Geyser Observation and Study Association (GOSA). Archived from the original on 2010-10-10. Retrieved 2009-03-11.
"Doublet Pool". Old Faithful Area Tour. National Park Service. Archived from the original on 2009-03-04.