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B`lgarskata Akademiya na Naukite, 1970
Buku Teks
Marina Shchepetunina, author
Graduate School of Language and Culture, Osaka University, 2018
Artikel Jurnal
Seleznev, Yuriy, author
Sovremennik, 1980
Buku Teks
Reformatskiy, Aleksandr Aleksandrovich, author
Aspekt Press, 1996
Buku Teks
Е.Б. Захава-Некрасова ...[et. al.]
Vysshaya Shkola, 1964
Buku Referensi