| 1. CIA - The World Factbook: Bulgaria
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| 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/bu.html |
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| 2. NationMaster - Bulgaria
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| Profile includes information for various aspects of the country, with a special emphasis on statistics and rankings. |
| http://www.nationmaster.com/country/bu-bulgaria |
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| 3. US Department of State - Bulgaria
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| Country portal offers a map and links to Background Notes, Country Study, the US embassy and the current ambassador, press releases, fact sheets, annual Human Rights Reports and other major reports including Industry Market Reports. |
| http://www.state.gov/p/eur/ci/bu |
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| 5. Wikipedia - Bulgaria
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| Hyperlinked encyclopedia article covers the country's history, government and politics, geography, economy, demographics, language and culture. |
| http://en.wikipedia.org/wiki/Bulgaria |
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