Ėnt︠s︡iklopedicheskiĭ slovarʹ /
Vvedenskiĭ, B. A.(Boris Alekseevich),1893-1969.
Moskva : Gos. nauch. izd-vo "Bolʹshai︠a︡ sovetskai︠a︡ ėnt︠s︡iklopedii︠a︡",
1953-1955.
1. A-Ĭ -- 2. K-Prashcha -- 3. Prashchur-I︠A︡i︠a︡.
Encyclopedias and dictionaries, Russian.