• 3 Memorial Library

• 2 Economic policy
• 2 Politics and government
• 1 Communism

• 2 Bundesinstitut für Ostwissenschaftliche und Internationale Studien (Germany)
• 1 Bŭlgarska akademii︠a︡ na naukite. T︠s︡entŭr po trakologii︠a︡ "Prof. Aleksandŭr Fol."
• 1 Institut za balkanistika (Bŭlgarska akademii︠a︡ na naukite)
• 1 United States. Embassy (Germany : West)
• 1 United States. Office of the US High Commissioner for Germany

• 2 English
• 1 Bulgarian
• 1 French
• 1 Russian

• 1 Balkan Peninsula

• 3 Periodicals

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