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
Moskwa Akademii Nauk SSSR 1963
Buku Teks
G.I. Makarova, L.V. Leonova, N.A. Grigorovich, T.D. Kovaleva; T.K. Yermolova; A.V. Gorodnichaya; S.YA. Mikhaylenko
L`vovskogo Universiteta, 1966
Buku Referensi