Columbia subject headings:
Architecture, Early Christian--Bulgaria--Sofia.
Church architecture--Bulgaria--Sofia.
Sofia (Bulgaria)--Buildings, structures, etc.
Sveta Sofii︠a︡ (Church : Sofia, Bulgaria)
Harvard subject headings:
Architecture, Early Christian--Bulgaria--Sofia.
Church architecture--Bulgaria--Sofia.
Sofia (Bulgaria)--Buildings, structures, etc.
Sveta Sofii͡a (Church : Sofia, Bulgaria)
Princeton subject headings:
Architecture, Early Christian--Bulgaria--Sofia.
Church architecture--Bulgaria--Sofia--History.
Sofia (Bulgaria)--Buildings, structures, etc.
Sveta Sofii︠a︡ (Church : Sofia, Bulgaria)