Ivanova, Vera Fedorovna, author
Leningradskogo Universiteta, 1962
Buku Referensi
Zvegintsev, Vladimir Andreyevich, author
Ministerstva Prosveshheniya RSFSR, 1960
Buku Teks
Deyanova, Mariya, author
B`lgarskata Akademiya na Naukite, 1970
Buku Teks
Vinogradov, Viktor Vladimirovich, author
Vysshaya Shkola, 1981
Buku Teks
Korolenko, Vladimir Galaktionovich, author
Khudozhestvennaya Literatura, 1965
Buku Teks