Kupina neopalimai︠a︡ : opyt dogmaticheskago istolkovanii︠a︡ ni︠e︡kotorykh chert v pravoslavnom pochitanii Bogomateri /
Bulgakov, Sergiĭ,1871-1944.
Parizh : Y.M.C.A. Press,
1927.
Immaculate Conception.