The World Publishing Co., 1960
Buku Referensi
The World Publishing Co., 1951
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Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Neufeldt, Victoria, author
Prentice Hall ; Modern English Press, 1993
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