Ivanovna, Astaf`yeva Nina
Vyshejshaya Shkola, 1973
Buku Teks
Kryuchkov, S. Ye.
Prosvesshenie, 1964
Buku Referensi
Golovin, Boris Nikolayevich
Prosveshchenie, 1971
Buku Referensi
Bondarko, Aleksandr Vladimirovich
Nauk, 1971
Buku Referensi
Ivanova, Vera Fedorovna
Uchebno-pedagogicheskoe, 1962
Buku Referensi