Kompetent︠s︡īi︠a︡ Ispolnitelʹnoĭ Vlasti v Moskovskoĭ Rusi. Chastʹ. 1. Vnutrenni︠a︡i︠a︡ okhrana gosudarstva / 
Free Russian University in Prague (Prague)
Shakhmatov, M. V.
The Hague, 
1966.