Flesch, Rudolf
A new way to better English / by Rudolf Flesch
Harper & Brothers, 1958
 Buku Teks
Wilson, George P., author
A guide to better english
F.S. Crofts, 1947
 Buku Teks
Yates, Paulene M.
Workbook and handbook : the new building better english / Paulene M. Yates, Edward N. de Laney
Harper & Row, 1962
 Buku Teks
English this way English Language Services.
London Collier-Macmillan 1965,
 Buku Teks
Hubbard, L. Ron, 1911-1986, author
The way to happiness : a common sense guide to better living.
L. Ron Hubbard Library, 2009
 Multimedia
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