Cyril and Methodius--creators of the slavonic script,
[by] Bonyu St. Angelov. (Translated by E. Mladenova and G. Pashova).

APA Citation

Angelov, B. St. (1969). Cyril and Methodius--creators of the slavonic script. (Sofia): Sofia Press.

MLA Citation

Angelov, Boni︠u︡ St. Cyril And Methodius--creators of the Slavonic Script. (Sofia): Sofia Press, 1969.

Warning: These citations may not always be complete (especially for serials).