George, V. Andreyeva
Russian Language Publishers, 1975
Buku Teks
Maytinskaya, Clara E., author
Nauka, 1969
Buku Referensi
Potapova, Nina F., author
Progress Publishers, [196-]
Buku Teks
Beloshapkova, Vera Arsen`yevna, author
Prosveshhenie, 1967
Buku Referensi
Smirnitsky, A.I., author
Higher School Publishing House, 1975
Buku Teks