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  • Attenborough, David. "Sotano de las Golondrinas." Planet Earth.
  • Jones, Cheryl. "Guide to Responsible Caving." National Speleological Society. http://www.caves.org/brochure/grc.pdf
  • Stanley, Matt. "About UIAA and CE helmet certification." Climbing Magazine. http://www.climbing.com/print/equipment/helmetcertif/
  • Quinion, Michael. "Spelunking." World Wide Words. http://www.worldwidewords.org/qa/qa-spe3.htm
  • "About Cave Diving." National Speleological Society Cave Diving Section. http://www.nsscds.com/training_new/aboutcavediving.htm
  • "American Caving Accidents." National Speleological Society. 2007. http://www.caves.org/pub/aca/07index.html
  • "Cave Directory." National Caves Association. http://cavern.com/caves/
  • The Cave of Lascaux. http://www.culture.gouv.fr/culture/arcnat/lascaux/en/
  • "Cave Science." National Caves Association. http://cavern.com/cave-science/
  • "Explore Cave Animals." U.S. Geological Survey. http://interactive2.usgs.gov/learningweb/
    teachers/explorecaves_animals.htm
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  • "How Stalactites and Stalagmites Form." U.S. National Park Service. http://www.nps.gov/ozar/forteachers/speleothems.htm
  • "Kazumura Cave" Caves of the United States of America. http://www.showcaves.com/english/usa/caves/Kazumura.html
  • "Ranger-Guided Cave Tours." Carlsbad Caverns. http://www.nps.gov/cave/planyourvisit/guidedcavetours.htm
  • "Recreational vs. Cave Diving Equipment: What's the Difference?" The Cave Diving Website. http://www.cavediving.com/how/compare/index.htm
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  • "Techniques." National Speleological Society. http://www.caves.org/safety/techniques.shtml
  • "Vertical Caving." An Introduction to Caves and Caving. http://cavingintro.net/vertical.html