Lewis, Norman
Thirty days to better English/ Norman Lewis,
Doubleday, 1965
Buku Teks
Howard, Godfrey, author
The good English guide: English usage in the 1990
Pan Macmillan Publishers, 1993
Buku Referensi
Blair, Walter, author
Factual prose. Better reading 1
Scott Foresman, 1955
Buku Teks
Carney, Edward
English spelling/ Edward Carney
Routledge,, 1997
Buku Teks
The Penguin spelling dictionary : market house books
Bloomsbury Books, 1991
Buku Referensi
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