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Buku Teks
Gunther, John, 1901-1970, author
Harper & Brothers, 1941
Buku Teks
edited by Howard J. Wiarda, Harvey F. Kline
Westview Press, 2007
Buku Teks
Lewis, Charlton T., author
New York American Book 1918
Buku Referensi
Janos, author
Budapest Franklin 1902
Buku Referensi