Harpp, K. S. (2014). The Galápagos: A natural laboratory for the Earth sciences. American Geophysical Union : John Wiley & Sons, Inc..
Lua i Stíl Chicago (17ú heag.)Harpp, Karen S. The Galápagos: A Natural Laboratory for the Earth Sciences. Washington, District of Columbia ; Hoboken, New Jersey: American Geophysical Union : John Wiley & Sons, Inc., 2014.
Lua MLA (9ú heag.)Harpp, Karen S. The Galápagos: A Natural Laboratory for the Earth Sciences. American Geophysical Union : John Wiley & Sons, Inc., 2014.
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