by Gosudarstvennai︠a︡ arkhivnai︠a︡ sluzhba Rossiĭskoĭ Federat︠s︡ii, Rossiĭskiĭ t︠s︡entr khranenii︠a︡ i izuchenii︠a︡ dokumentov noveĭsheĭ istorii, Hoover Institution on War, Revolution, and Peace, Gosudarstvennyĭ arkhiv Rossiĭskoĭ Federat︠s︡ii, Chadwyck-Healey Ltd, T︠S︡entr khranenii︠a︡ sovremennoĭ dokumentat︠s︡ii (Russia)