APA (7th ed.) Citation

Vasilev, V. A. (1979). Bulgaria, 13 centuries of existence. Sofia Press.

Chicago Style (17th ed.) Citation

Vasilev, Vasil Atanasov. Bulgaria, 13 Centuries of Existence. [Sofia]: Sofia Press, 1979.

MLA (9th ed.) Citation

Vasilev, Vasil Atanasov. Bulgaria, 13 Centuries of Existence. Sofia Press, 1979.

Warning: These citations may not always be 100% accurate.