CIA - The World Factbook: Bulgaria
- 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

Wikipedia - Bulgaria
- Hyperlinked encyclopedia article covers the country's history, government and politics, geography, economy, demographics, language and culture.
- http://en.wikipedia.org/wiki/Bulgaria

NationMaster - Bulgaria
- Profile includes information for various aspects of the country, with a special emphasis on statistics and rankings.
- http://www.nationmaster.com/country/bu-bulgaria

US Library of Congress - Portals to the World: Bulgaria
- Annotated directory of selected online resources.
- http://www.loc.gov/rr/international/european/bulgaria/bg.html

US Department of State - Bulgaria
- 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/