- CIA World Factbook. San Tome and Principe - Introduction,  Geography,  People,  Government,  Economy,  Communications,  Transportation,  Military,  Transnational Issues.  (https://www.cia.gov/library/publications/the-world-factbook/geos/tp.html)

- Africa Guide. Travel Information. (http://www.africaguide.com/country/sao_tome/index.htm)

- Travel Notes™ guides visitors to essential travel information with detailed country backgrounds, reviewed web sites, and regular travel articles. (http://www.travelnotes.org/Africa/sao_tome.htm)