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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
Verhoeven, P. Th. L., author
Ende, Nusa Indah, 1969
Buku Referensi