OGPU, the Russian secret terror /
Agabekov, G. S.(Grigoriĭ Sergeevich)
Westport, Conn. : Hyperion Press,
1975.
Reprint of the 1931 ed. published by Brentano's, New York.
Translation of G.P.U. (zapiski chekista)
Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie.
Russian S.F.S.R. Chrazvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem.