The following sources were consulted in the preparation of the article “12 countries that no longer exist.”
- The Acting Political Adviser for Germany (Muccio) to the Secretary of State
- United Arab Republic
- Czechoslovakia
- The Collapse of the Soviet Union
- What is the former Yugoslavia?
- 3 October: Day of German Unity
- Letter from Liliuokalani, Queen of Hawaii to U.S. House of Representatives protesting U.S. assertion of ownership of Hawaii, December 19, 1898
- The Texas Revolution and the Republic of Texas: A Brief History
- A Guide to the United States’ History of Recognition, Diplomatic, and Consular Relations, by Country, since 1776: Colombia
- Newfoundland and Labrador’s provincial symbols
- 1964 The Union of Tanganyika and Zanzibar Act
- South Africa: History