Russkai︠a︡ religiozno-filosofskai︠a︡ myslʹ XX veka = Russian religious-philosophical thought of the 20th century /
Poltoratzky, Nikolai P.
Pittsburg :  Otdel slavi︠a︡nskikh i︠a︡zykov i literatur Pittsburgskogo universiteta, 
1975.
Religious thought
Philosophy, Russian