CIA - The World Factbook: Clipperton Island - Features map and brief descriptions of the geography, people, government, economy, communications, transportation, military and transnational issues. - https://www.cia.gov/library/publications/the-world-factbook/geos/ip.html
NationMaster - Clipperton Island - Profile includes information for various aspects of the country, with a special emphasis on statistics and rankings. - http://www.nationmaster.com/country/ip-clipperton-island
Wikipedia - Clipperton Island - Hyperlinked encyclopedia article offers a map, description and some history of the island. - http://en.wikipedia.org/wiki/Clipperton_Island