Pribaltīĭskīe n︠i︡em︠t︡sy : ikh otnoshenīe k russkoĭ gosudarstvennosti i k korennomu naselenī︠i︡u kra︠i︡a v proshlom i nasto︠i︡ashchem - Vigrab, G. I. (Russian history and culture, 1916)