Wilson, George P.
A guide to better english
F.S. Crofts, 1947
 Buku Teks
Lewis, Roy
English middle classes / Roy Lewis
Penguin Books, 1949
 Buku Teks
Kallaus, Norman Francis, 1924-
Administrative office management / Norman F. Kallaus, B. Lewis Keeling
South-Western Publishing, 1987
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Day-Lewis, Sean
C. Day-Lewis an English literary life
Weidenfeld and Nicolson, 1980
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Flesch, Rudolf
A new way to better English / by Rudolf Flesch
Harper & Brothers, 1958
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