Lapidus, B.A., author
State Publishing House of Foreign and National Dictionaries, 1962
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Voinova, N., author
Enciclopedia Sovietica, 1964
Buku Referensi
Lordkipanidze, A. G., compiler
Badan Penerbit Kamus Asing dan Nasional Negara , 1963
Buku Referensi
Segal, Louis, author
Frederick A. Praeger, 1959
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O`brien, M.A., author
George Allen and Unwin, 1930
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