Azbuka khorovogo p︠i︡enī︠i︡a : s prakticheskimi upr︠i︡azhnenī︠i︡ami i kratko︠i︡u khristomatīe︠i︡u - Solovʹev, D. N. (Dmitrīĭ Nikolaevich) (Russian history and culture, 1916)